style.css

html {
    height: 100%;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100%;
    margin: 0;
    background: linear-gradient(to bottom, rgb(101, 54, 98), rgb(81, 105, 114));
    text-align: center;
    font-family: sans-serif;
}

nav {
    position: fixed;
    top: 0;
    right: 0;
    text-align: right;
    padding: 8px;
}

a {
    color: black;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

main {
    margin: 8px;
}

input,
button {
    padding: 8px;
    border: 1px solid deepskyblue;
    border-radius: 8px;
    font-size: 16px;
}

#thankyouMessage{
    opacity: 0;
    transition: all 0.5s;
    background-color: rgb(21, 41, 34);
    padding: 20px;
    border-radius: 15px;
    color: antiquewhite;
}