body {
    background-color: white;
    min-height: 100vh;
}

main {
    width: calc(100% - 40px);
    padding: 20px;
    max-width: 800px;
    margin: 20px auto;
    background-color: #fff;
    box-shadow: 5px 5px 10px 10px #0008;
    font-family: sans-serif;
}

form {
    display: flex;
    flex-flow: column nowrap;
    align-items: flex-start;
    width: 100%;
}

form label, form textarea {
    width: 100%;
}

footer {
    width: calc(100% - 100px);
    padding: 50px 50px;
    margin: 10px 0 0;
}

@media only screen and (min-width: 700px) {
    main {
        margin: 100px auto;
    }

    footer {
        width: calc(100% - 200px);
        padding: 50px 100px;
        margin: 10px 0 0;
    }
}