style.css

@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500&display=swap');
body {
    margin: 0;
    padding: 1rem;
    box-sizing: border-box;
    height: 100vh;
    background-color: #20272B;
    color: #E0E7FF;
    font-family: 'Roboto', sans-serif;
    padding: 0;
}

nav {
    background-color: #00C3AE;
    padding: .8rem 2rem;
    font-size: 1.5rem;
    margin-bottom: 6rem;
    font-weight: 500;
}

.cont {
    width: 70%;
    max-width: 600px;
    display: flex;
    flex-direction: column;
    margin: auto;
}

input {
    width: 80%;
    margin: 1rem auto;
    padding: .5rem 2rem;
    border-radius: .3rem;
}

button {
    width: 50%;
    margin: 1rem auto;
    padding: .5rem 2rem;
    border-radius: .3rem;
    border: 1px solid black;
    background-color: #00C3AE;
    color: #fff;
    letter-spacing: .2rem;
}

p {
    padding: 2rem;
    font-size: large;
}

#loading {
    margin: 2rem auto;
    display: none;
}

#result {
    text-align: center;
    padding: 1rem 2rem;
    background-color: #3B4042;
    border-radius: .5rem;
    margin: 1.5rem 0;
    display: none;
}