diff --git a/config/mysql_connection.js b/config/mysql_connection.js
index c0b63c5..5c89cf6 100644
--- a/config/mysql_connection.js
+++ b/config/mysql_connection.js
@@ -1,11 +1,11 @@
-const mysql=require('mysql')
+const mysql = require('mysql');
+require('dotenv').config();
 
-require("dotenv").config()
-const DB_HOST = process.env.DB_HOST
-const DB_USER = process.env.DB_USER
-const DB_PASSWORD = process.env.DB_PASSWORD
-const DB_DATABASE = process.env.DB_DATABASE
-const DB_PORT = process.env.DB_PORT
+const DB_HOST = process.env.DB_HOST;
+const DB_USER = process.env.DB_USER;
+const DB_PASSWORD = process.env.DB_PASSWORD;
+const DB_DATABASE = process.env.DB_DATABASE;
+const DB_PORT = process.env.DB_PORT;
 
 const db = mysql.createPool({
     connectionLimit: 100,
@@ -14,6 +14,25 @@ const db = mysql.createPool({
     password: DB_PASSWORD,
     database: DB_DATABASE,
     port: DB_PORT
-})
+});
 
-module.exports = db
\ No newline at end of file
+// Check connection
+db.getConnection((err, connection) => {
+    if (err) {
+        if (err.code === 'PROTOCOL_CONNECTION_LOST') {
+            console.error('Database connection was closed.');
+        }
+        if (err.code === 'ER_CON_COUNT_ERROR') {
+            console.error('Database has too many connections.');
+        }
+        if (err.code === 'ECONNREFUSED') {
+            console.error('Database connection was refused.');
+        }
+    }
+
+    if (connection) connection.release();
+
+    return;
+});
+
+module.exports = db;
diff --git a/public/choose-file.html b/public/choose-file.html
index ef3a401..2d88227 100644
--- a/public/choose-file.html
+++ b/public/choose-file.html
@@ -86,7 +86,8 @@
 </head>
 
 <body>
-  <img src="images/moon.png" id="icon">
+  <img src="images/moon.webp" id="icon">
+
   <div class="container">
     <h2>Select Who You Are</h2>
     <div class="radio">
diff --git a/public/contact-us.html b/public/contact-us.html
index 0b79aff..708c709 100644
--- a/public/contact-us.html
+++ b/public/contact-us.html
@@ -17,10 +17,10 @@
 </head>
 
 <body>
-    <img src="images/moon.png" id="icon">
+    <img src="images/moon.webp" id="icon">
     <div class="maindiv">
         <div class="imgdiv">
-            <img src="./images/logo.png" alt="" style="border-radius: 6px;">
+            <img src="./images/logo.webp" alt="" style="border-radius: 6px;">
         </div>
         <div class="formdiv">
             <form action="" class="form">
diff --git a/public/fac_login.html b/public/fac_login.html
index 2c52c80..f9d608b 100644
--- a/public/fac_login.html
+++ b/public/fac_login.html
@@ -9,10 +9,10 @@
 </head>
 
 <body>
-    <img src="images/moon.png" id="icon">
+    <img src="images/moon.webp" id="icon">
     <div class="container">
         <div class="image">
-            <img src="images/logo.png" alt="">
+            <img src="images/logo.webp" alt="">
         </div>
         <div id="box2">
             <p>Sorry! User not found</p>
diff --git a/public/faculty.html b/public/faculty.html
index af47a12..9aa6696 100644
--- a/public/faculty.html
+++ b/public/faculty.html
@@ -16,13 +16,13 @@
     <p id="result2"><i class="fa-solid fa-xmark" style="padding: 0px 12px;font-size: 26px;"></i>An error occured</p>
     <header>
         <div class="head">
-            <div class="logo"><img src="images/logo.png" alt="" width="160px"></div>
+            <div class="logo"><img src="images/logo.webp" alt="" width="160px"></div>
             <div id="heading" style="font-size: 34px;color: white;">Research Nexas</div>
             <div>
                 <a href="" title="View Profile"><i class="fa-solid fa-user"
                         style="font-size: 30px;padding: 12px 13px;border:3px solid white;border-radius:50%;color:white"></i></a>
             </div>
-            <img src="images/moon.png" id="icon">
+            <img src="images/moon.webp" id="icon">
         </div>
         <nav>
     </header>
@@ -34,7 +34,7 @@
         </div>
         <div class="containers">
             <div class="boxes" id="box1">
-                <img src="images/badges.png" alt="">
+                <img src="images/badges.webp" alt="">
                 <h4>Evaluation Criteria</h4>
                 <p style="color: white;">Lorem ipsum dolor, sit amet consectetur adipisicing elit. Fugit repellendus
                     dolorum quas delectus,
@@ -44,7 +44,7 @@ <h4>Evaluation Criteria</h4>
                     Culpa voluptatum enim assumenda nostrum!</p>
             </div>
             <div class="boxes" id="box2">
-                <img src="images/badges.png" alt="">
+                <img src="images/badges.webp" alt="">
                 <h4>Evaluated Papers</h4>
                 <p style="color: white;">Lorem ipsum dolor, sit amet consectetur adipisicing elit. Fugit repellendus
                     dolorum quas delectus,
@@ -54,7 +54,7 @@ <h4>Evaluated Papers</h4>
                     Culpa voluptatum enim assumenda nostrum!</p>
             </div>
             <div class="boxes" id="box3">
-                <img src="images/badges.png" alt="">
+                <img src="images/badges.webp" alt="">
                 <h4>Your Profile</h4>
                 <p style="color: white;">Lorem ipsum dolor, sit amet consectetur adipisicing elit. Fugit repellendus
                     dolorum quas delectus,
diff --git a/public/form_filling.html b/public/form_filling.html
index b5cab15..986c930 100644
--- a/public/form_filling.html
+++ b/public/form_filling.html
@@ -40,6 +40,7 @@
             <div class="form-group">
                 <label>Email</label>
                 <input type="email" name="email" id="email">
+                <p id="emailError" style="font-size: 18px; color: red; font-weight: bold; display: none;"></p>
             </div>
             <div class="form-group">
                 <label for="exampleInputPassword1">College Name</label>
@@ -83,7 +84,6 @@
                     <option value="Uttar Pradesh">Uttar Pradesh</option>
                     <option value="Uttarakhand">Uttarakhand</option>
                     <option value="West Bengal">West Bengal</option>
-
                 </select>
             </div>
             <div class="form-group">
@@ -117,9 +117,6 @@
                 <button type="submit" class="btn btn-primary">Submit</button>
             </div>
         </form>
-        <!-- <div id="loader">
-        <p>Checking info...Redirecting...</p>
-    </div> -->
         <script>
             const currentYear = new Date().getFullYear();
             const graduationYearSelect = document.getElementById('year');
@@ -130,6 +127,27 @@
                 graduationYearSelect.appendChild(option);
             }
 
+            // Real-time email validation and error display
+            const emailInput = document.getElementById('email');
+            const emailError = document.getElementById('emailError');
+
+            emailInput.addEventListener('input', function () {
+                const emailValue = emailInput.value;
+                const allowedDomains = ['gmail.com', 'yahoo.com', 'outlook.com', 'icloud.com', 'hotmail.com'];
+
+                if (emailValue) {
+                    const emailDomain = emailValue.split('@')[1]; // Get the domain part of the email
+                    if (!allowedDomains.includes(emailDomain)) {
+                        emailError.textContent = "Please use an email from trusted providers (Gmail, Yahoo, Outlook, etc.)";
+                        emailError.style.display = 'block';
+                    } else {
+                        emailError.style.display = 'none'; // Hide error if domain is valid
+                    }
+                } else {
+                    emailError.style.display = 'none'; // Hide error if input is empty
+                }
+            });
+
             document.getElementById('form').addEventListener('submit', async function (event) {
                 event.preventDefault();
                 const name = document.getElementById('name').value;
@@ -139,9 +157,22 @@
                 const dept = document.getElementById('dept').value;
                 const course = document.getElementById('course').value.toUpperCase();
                 const year = document.getElementById('year').value;
+
                 const result = document.getElementById('result');
-                const result3 = document.getElementById('result3')
                 const result2 = document.getElementById('result2');
+                const result3 = document.getElementById('result3');
+
+                // Validate email domain again before submission
+                const allowedDomains = ['gmail.com', 'yahoo.com', 'outlook.com', 'icloud.com', 'hotmail.com'];
+                const emailDomain = email.split('@')[1]; // Get the domain part of the email
+                if (!allowedDomains.includes(emailDomain)) {
+                    result2.innerText = "Please use an email from trusted providers (Gmail, Yahoo, Outlook, etc.)";
+                    result2.style.display = "block";
+                    setTimeout(() => {
+                        result2.style.display = "none";
+                    }, 3000);
+                    return; // Stop form submission
+                }
 
                 const data = { name, email, col_name, state, course, year, dept };
                 const token = localStorage.getItem('accessToken');
@@ -180,7 +211,7 @@
                 } catch (error) {
                     console.error("Error occurred", error);
                 }
-            })
+            });
 
             async function usercheck() {
                 const token = localStorage.getItem('accessToken');
@@ -196,9 +227,8 @@
                 }
             }
             usercheck();
-
         </script>
     </section>
 </body>
 
-</html
+</html>
diff --git a/public/images/Design 1.png b/public/images/Design 1.png
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deleted file mode 100644
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new file mode 100644
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diff --git a/public/images/career_pic.webp b/public/images/career_pic.webp
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index 0000000..cb51632
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diff --git a/public/images/collaborate.jpg b/public/images/collaborate.jpg
deleted file mode 100644
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diff --git a/public/images/collaborate.webp b/public/images/collaborate.webp
new file mode 100644
index 0000000..a5b3e2e
Binary files /dev/null and b/public/images/collaborate.webp differ
diff --git a/public/images/connect.png b/public/images/connect.png
deleted file mode 100644
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diff --git a/public/images/connect.webp b/public/images/connect.webp
new file mode 100644
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diff --git a/public/images/connectpeers.png b/public/images/connectpeers.png
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diff --git a/public/images/dark_mode.png b/public/images/dark_mode.png
deleted file mode 100644
index 55ac095..0000000
Binary files a/public/images/dark_mode.png and /dev/null differ
diff --git a/public/images/dark_mode.webp b/public/images/dark_mode.webp
new file mode 100644
index 0000000..78aaac8
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diff --git a/public/images/explorepapers.png b/public/images/explorepapers.png
deleted file mode 100644
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diff --git a/public/images/follow.jpeg b/public/images/follow.jpeg
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diff --git a/public/images/logo.png b/public/images/logo.png
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diff --git a/public/images/logo.webp b/public/images/logo.webp
new file mode 100644
index 0000000..513d8b8
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diff --git a/public/images/moon.png b/public/images/moon.png
deleted file mode 100644
index e86aa00..0000000
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diff --git a/public/images/moon.webp b/public/images/moon.webp
new file mode 100644
index 0000000..84fd701
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diff --git a/public/images/plagiarism.png b/public/images/plagiarism.png
deleted file mode 100644
index 3f4d2c8..0000000
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diff --git a/public/images/plagiarism.webp b/public/images/plagiarism.webp
new file mode 100644
index 0000000..73ae07d
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diff --git a/public/images/sun.png b/public/images/sun.png
deleted file mode 100644
index a698922..0000000
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diff --git a/public/images/sun.webp b/public/images/sun.webp
new file mode 100644
index 0000000..a523410
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diff --git a/public/images/upload-image.jpg b/public/images/upload-image.jpg
deleted file mode 100644
index 28cfbd3..0000000
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diff --git a/public/images/upload-image.webp b/public/images/upload-image.webp
new file mode 100644
index 0000000..9f0aec2
Binary files /dev/null and b/public/images/upload-image.webp differ
diff --git a/public/images/wave.svg b/public/images/wave.svg
deleted file mode 100644
index 24965a3..0000000
--- a/public/images/wave.svg
+++ /dev/null
@@ -1 +0,0 @@
-<?xml version="1.0" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="" fill-opacity="1" d="M0,224L40,202.7C80,181,160,139,240,112C320,85,400,75,480,69.3C560,64,640,64,720,90.7C800,117,880,171,960,208C1040,245,1120,267,1200,240C1280,213,1360,139,1400,101.3L1440,64L1440,320L1400,320C1360,320,1280,320,1200,320C1120,320,1040,320,960,320C880,320,800,320,720,320C640,320,560,320,480,320C400,320,320,320,240,320C160,320,80,320,40,320L0,320Z"></path></svg>
\ No newline at end of file
diff --git a/public/images/wave.webp b/public/images/wave.webp
new file mode 100644
index 0000000..beeabde
Binary files /dev/null and b/public/images/wave.webp differ
diff --git a/public/index.html b/public/index.html
index cd64e05..f494ebb 100644
--- a/public/index.html
+++ b/public/index.html
@@ -82,19 +82,19 @@ <h2>About Us</h2>
         <div class="slider">
             <div class="list">
                 <div class="item">
-                    <img src="images/Design 1.png" alt="">
+                    <img src="images/Design 1.webp" alt="">
                 </div>
                 <div class="item">
-                    <img src="images/connect.png" alt="">
+                    <img src="images/connect.webp" alt="">
                 </div>
                 <div class="item">
-                    <img src="images/career_pic.jpg" alt="">
+                    <img src="images/career_pic.webp" alt="">
                 </div>
                 <div class="item">
-                    <img src="images/collaborate.jpg" alt="">
+                    <img src="images/collaborate.webp" alt="">
                 </div>
                 <div class="item">
-                    <img src="images/badges.png" alt="">
+                    <img src="images/badges.webp" alt="">
                 </div>
             </div>
             <div class="buttons">
@@ -210,14 +210,14 @@ <h3>Top Services</h3>
         <div class="all-boxes">
             <div class="box show hidden">
                 <h3>Plagiarism Checker</h3>
-                <img src="images/plagiarism.png" alt="Plagiarism Checker Icon" style="width:150; height: 150px; border-radius: 15px; border: 2px solid #ccc;">
+                <img src="images/plagiarism.webp" alt="Plagiarism Checker Icon" style="width:150; height: 150px; border-radius: 15px; border: 2px solid #ccc;">
                 <p>
                     Ensure your content is original with our advanced plagiarism detection tool, and receive detailed reports to uphold integrity in your writing.
                 </p>
             </div>
             <div class="box show hidden">
                 <h3>Explore Papers</h3>
-                <img src="images/explorepapers.png" alt="project" style="width:150; height: 150px; border-radius: 15px; border: 2px solid #ccc;">
+                <img src="images/explorepapers.webp" alt="project" style="width:150; height: 150px; border-radius: 15px; border: 2px solid #ccc;">
                 <p>Experience seamless research collaboration as students, stakeholders, and faculty connect easily.
                   Turn submissions into impactful evaluations with a few clicks!
                 </p>
@@ -225,12 +225,12 @@ <h3>Explore Papers</h3>
           
             <div class="box show hidden">
                 <h3>Follow Groups</h3>
-                <img src="images/follow.jpeg" alt="follow group" style="width:200; height: 150px; border-radius: 15px; border: 2px solid #ccc;">
+                <img src="images/follow.webp" alt="follow group" style="width:200; height: 150px; border-radius: 15px; border: 2px solid #ccc;">
                 <p>Stay in the loop with your favorite research groups follow, engage, and collaborate on the topics that matter most.</p>
             </div>
             <div class="box show hidden">
                 <h3>Boost Level</h3>
-                <img src="images/boost.png" alt="boost" style="width:150; height: 150px; border-radius: 15px; border: 2px solid #ccc;">
+                <img src="images/boost.webp" alt="boost" style="width:150; height: 150px; border-radius: 15px; border: 2px solid #ccc;">
                 <p>Amplify your academic reach boost your growth with a network that supports and inspires 
                     with powerful partnerships, transforming ideas into impactful research outcomes.
                 </p>
@@ -238,7 +238,7 @@ <h3>Boost Level</h3>
            
             <div class="box show hidden">
                 <h3>Career Opportunities</h3>
-                <img src="images/career.png" alt="career" style="width:150; height: 150px; border-radius: 15px; border: 2px solid #ccc;">
+                <img src="images/career.webp" alt="career" style="width:150; height: 150px; border-radius: 15px; border: 2px solid #ccc;">
                 <p>Turn your academic achievements into career opportunities, opening doors to roles that match your expertise and aspirations.
                     </p>
             </div>
diff --git a/public/login.html b/public/login.html
index cafc581..0b60e70 100644
--- a/public/login.html
+++ b/public/login.html
@@ -9,10 +9,10 @@
 </head>
 
 <body>
-    <img src="images/moon.png" id="icon">
+    <img src="images/moon.webp" id="icon">
     <div class="container">
         <div class="image">
-            <img src="images/logo.png" alt="">
+            <img src="images/logo.webp" alt="">
         </div>
         <div id="box2">
             <p>Sorry! User not found</p>
diff --git a/public/main_page.html b/public/main_page.html
index 7901f0c..7f3d01f 100644
--- a/public/main_page.html
+++ b/public/main_page.html
@@ -12,7 +12,7 @@
 <body>
     <header>
         <div class="head">
-            <div class="logo"><img src="images/logo.png" alt="" width="160px"></div>
+            <div class="logo"><img src="images/logo.webp" alt="" width="160px"></div>
             <div id="heading" style="font-size: 34px;color: white;">Research Nexas</div>
             <div>
                 <a href="dashboard.html" title="View Profile"><i class="fa-solid fa-user"
@@ -93,7 +93,7 @@ <h2>Preview Past Papers</h2>
                 <a href="">View Papers<i class="fa-sharp fa-solid fa-eye" style="padding: 0px 12px;"></i></a>
             </div>
             <div class="pyq_images">
-                <img src="images/connect.png" alt="">
+                <img src="images/connect.webp" alt="">
             </div>
         </div>
     </section>
@@ -113,7 +113,7 @@ <h2>Approval</h2>
 
             </div>
             <div class="approval_images">
-                <img src="images/badges.png" alt="">
+                <img src="images/badges.webp" alt="">
             </div>
         </div>
     </main>
diff --git a/public/signup.html b/public/signup.html
index cd9eb7b..f22ee96 100644
--- a/public/signup.html
+++ b/public/signup.html
@@ -32,10 +32,10 @@
 </head>
 
 <body>
-  <img src="images/moon.png" id="icon">
+  <img src="images/moon.webp" id="icon">
   <div class="container">
     <div class="image">
-      <img src="images/logo.png" alt="">
+      <img src="images/logo.webp" alt="">
     </div>
     <div id="box2">
       <p>Please Try Again!! Account Already Exists</p>
diff --git a/public/stk_login.html b/public/stk_login.html
index 0b6206d..741e5d2 100644
--- a/public/stk_login.html
+++ b/public/stk_login.html
@@ -9,10 +9,10 @@
 </head>
 
 <body>
-    <img src="images/moon.png" id="icon">
+    <img src="images/moon.webp" id="icon">
     <div class="container">
         <div class="image">
-            <img src="images/logo.png" alt="">
+            <img src="images/logo.webp" alt="">
         </div>
         <div id="box2">
             <p>Sorry! User not found</p>
diff --git a/public/stk_mainpage.html b/public/stk_mainpage.html
index c7af422..aaa0fc8 100644
--- a/public/stk_mainpage.html
+++ b/public/stk_mainpage.html
@@ -13,13 +13,13 @@
 
 <body>
     <div class="head">
-        <div class="logo"><img src="images/logo.png" alt="" width="160px"></div>
+        <div class="logo"><img src="images/logo.webp" alt="" width="160px"></div>
         <div id="heading" style="font-size: 34px;color: white;">Research Nexas</div>
         <div>
             <a href="stk_dashboard.html" title="View Profile"><i class="fa-solid fa-user"
                     style="font-size: 30px;padding: 12px 13px;border:3px solid white;border-radius:50%;color:white"></i></a>
         </div>
-        <img src="images/moon.png" id="icon">
+        <img src="images/moon.webp" id="icon">
     </div>
     <main>
         <div class="main">
@@ -77,7 +77,7 @@ <h2>Paper Allotment</h2>
                     nostrum excepturi, et aliquam quos?</p>
             </div>
             <div class="image">
-                <img src="images/career_pic.jpg" alt="">
+                <img src="images/career_pic.webp" alt="">
             </div>
         </div>
         <div id="criteria">
diff --git a/public/stk_signup.html b/public/stk_signup.html
index 62c7861..48a2147 100644
--- a/public/stk_signup.html
+++ b/public/stk_signup.html
@@ -9,7 +9,7 @@
 </head>
 
 <body>
-    <img src="images/moon.png" id="icon">
+    <img src="images/moon.webp" id="icon">
     <div id="box2">
         <p>Please Try Again! Account Already Exists</p>
     </div>
@@ -18,7 +18,7 @@
     </div>
     <div class="container">
         <div class="image">
-            <img src="images/logo.png" alt="">
+            <img src="images/logo.webp" alt="">
         </div>
         <div class="form">
             <form>
