custom.css

.docblock pre.rust { background: #eeeeff; }
pre.trait, pre.fn, pre.struct, pre.enum, pre.typedef { background: #fcfefc; }

/* Small “example” label for doc examples */
.docblock pre.rust::before {
    content: "example";
    float: right;
    font-style: italic;
    font-size: 0.8em;
    margin-top: -10px;
    margin-right: -5px;
}


/* Fixup where display in trait listing */
pre.trait .where::before {
content: '\a         ';
}

.docblock code {
    background-color: inherit;
    font-weight: bold;
    padding: 0 0.1em;
}