@media only screen and (min-width: 0) {
    * {
        padding: 0;
        margin: 0;
    }
    body {
        width: 100%;
        float: left;
        background-color: rgba(0, 0, 0, .1);
    }
    header, main, footer {
        width: 100%;
        float: left;
    }
    main>div {
        width: calc(90% - 4em);
        margin-left: 5%;
        margin-right: 5%;
        margin-top: 35%;
        background-color: white;
        border-radius: 1em;
        box-shadow: 1px 1px 1px #AAA;
        padding: 2em;
    }
    main>div>* {
        display: inline-block;
        width: 100%;
        text-align: center;
    }
    main>div>p {
        margin-top: .5em;
    }
    main>div>a {
        margin-top: 1.5em;
    }
}
@media only screen and (min-width: 1000px) {
    main>div {
        width: calc(70% - 4em);
        margin-top: 15%;
        margin-left: 15%;
        margin-right: 15%;
    }
}