html, body {
    height: 100%;
}
body {
    margin: 0;
    background: midnightblue;
    color: #111;
    font-size: 1rem;
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.5;
}
a {
    color: blue;
}
.container {
    margin: auto;
    max-width: 37rem;
    background: #fff;
    padding: 1rem;
}
img {
    display: block;
    max-width: 100%;
    max-height: 10rem;
    height: auto;
}

table {
    border-collapse: collapse;
    width: 100%;
}
td, th {
    text-align: left;
    padding: 8px;
}
tr:nth-child(even) {
    background: #eee;
}

@media (max-width: 39rem) {
    .container {
        min-height: 100%;
    }
}
pre, code {
    font-family: "DejaVu Sans Mono", Consolas, monospace;
    background: #111;
    color: #fff;
    padding: .5rem; 
    max-width: 100%;
    display: block;
    overflow-x: auto;
    overflow-y: hidden;
}