* {
    box-sizing: border-box;
    border-radius: 1rem;
}

body {
    margin: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: center;
    background-color: #eeeeee;
    min-height: 100vh;
    padding: 3rem;
    font-family: sans-serif;
}

main {
    padding: 1em;
    background-color: white;
    margin: auto;
    max-width: 1200px;
}

#back {
    position: fixed;
    bottom: 1em;
    right: 1em;
    padding: 1em;
    background: white;
    border: 1px solid rgba(121, 121, 121, 0.42);
}

@media only screen and (max-width: 600px) {
    body {
        padding: 0;
    }

    main {
        border-radius: 0;
        flex-grow: 1;
        margin: 0;
    }

    #back {
        position: static;
        border-radius: 0;
    }
}