home-manager/overrides.css

.docbook .xref img[src^=images\/callouts\/],
.screen img,
.programlisting img {
    width: 1em;
}

.calloutlist img {
    width: 1.5em;
}

/** The console prompt, e.g., `$` and `#` should not be selectable. */
.programlisting.console .hljs-meta {
    user-select: none;
}