style.css

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
}

.flex-wrapper {
    display: flex;
    width: 100%;
    height: 100vh;
    align-items: center;
    justify-content: center;
}

.feedback-form {
    width: 400px;
    height: 550px;
    background-color: rgb(180, 255, 255);
    border-radius: 10px;
    padding: 15px 25px;
    text-align: center;
    font-size: 1.3rem;
}

.feedback-form input,
.feedback-form textarea {
    margin: 15px 0;
    width: 100%;
    border: 1px solid rgba(0, 0, 0, .2);
    border-radius: 10px;
    padding: 7px 20px;
    outline: none;
    font-size: 1.1rem;
}

.feedback-form .submit-button {
    width: 250px;
    padding: 10px 20px;
    margin: 15px 0;
    font-size: 1.2rem;
    text-transform: uppercase;
}

.form-label {
    display: block;
    margin: 10px 0;
}