html {
 background-color:#fefefe
}

body {
 font-family:sans-serif;
 color:#454545;
 font-size:600;
 margin:2em auto;
 max-width:800px;
 padding:1em;
 line-height:1.4;
 text-align:left;
}

footer {
    margin-top: 2em;
    text-align: center;
}

img, video, code {
    max-width: 100%;
}