body {
    display: block;
    width: 916px;
    margin: 0 auto;
    padding: 8px;
    box-sizing: border-box;
    font: 12pt Tahoma, Helvetica, sans-serif;
}
h1 {
    border-bottom: 1px solid #ccc;
}
.CodeMirror {
    border: 1px solid #ccc;
}
pre {
    display: block;
    overflow: auto;
    width: 100%;
    border: 1px solid #ccc;
    background: #eee;
    padding: 4px;
}
button {
    background: linear-gradient(#fff, #eee);
    font: inherit;
    padding: 4px 8px;
    border: 1px solid #ccc;
    cursor: pointer;
    color: #000;
}
button[type=submit] {
    background: linear-gradient(#efe, #cec);
    border-color: #9c9;
}