codex/resources/style-formatted.css

body {
    color: FG;
    background: NORMALBG;
    font-family: serif;
    margin: 2em;
    max-width: 50em;
    margin-left: 4em;
    margin-right: 4em;
}

a {
    color: FG;
    text-decoration: none;
}

a:hover {
    color: NORMALBG;
    background: FG;
}

pre {
    background: CODEBG;
    padding: 0.5em;
}

code {
    background: CODEBG;
    padding: 0.2em;
}

hr {
    width: 50%;
    border-top: 0px;
    text-align: left;
    margin-left: 0;
}