Module:Sidebar/styles.css

/* {{Protected high use}} */
/* TODO: Invert width design to be "mobile first" */
.sidebar {
    /* TODO: Ask if we should have max-width 22em instead */
    width: 22em;
    /* @noflip */
    float: right;
    /* @noflip */
    clear: right;
    /* @noflip */
    margin: 0.5em 0 1em 1em;
    background: #f8f9fa;
    border: 1px solid #aaa;
    padding: 0.2em;
    text-align: center;
    line-height: 1.4em;
    font-size: 88%;
    border-collapse: collapse;
    /* Timeless has display: none on .nomobile at mobile resolutions, so we
     * unhide it with display: table and let precedence and proximity win.
     */
    display: table;
}

/* Unfortunately, so does Minerva desktop, except Minerva drops an
 * !important on the declaration. So we have to be mean for Minerva users.
 * Mobile removes the element entirely with `wgMFRemovableClasses` in
 * https://github.com/wikimedia/operations-mediawiki-config/blob/master/
 wmf-config/InitialiseSettings.php#L16992
 * which is why displaying it categorically with display: table works.
 * We don't really want to expose the generic user in the wild on mobile to have
 * to deal with sidebars. (Maybe the ones with collapsible lists, so that
 * might be an improvement. That is blocked on [[:phab:T111565]].)
 */
body.skin-minerva .sidebar {
    display: table !important;
    /* also, minerva is way too aggressive about other stylings on tables.
     * TODO remove when this template gets moved to a div. plans on talk page.
     * We always float right on Minerva because that's a lot of extra CSS
     * otherwise. */
    float: right !important;
    margin: 0.5em 0 1em 1em !important;
}

.sidebar-subgroup {
    width: 100%;
    margin: 0;
    border-spacing: 0;
}

.sidebar-left {
    /* @noflip */
    float: left;
    /* @noflip */
    clear: left;
    /* @noflip */
    margin: 0.5em 1em 1em 0;
}

.sidebar-none {
    float: none;
    clear: both;
    /* @noflip */
    margin: 0.5em 1em 1em 0;
}

.sidebar-outer-title {
    padding: 0 0.4em 0.2em;
    font-size: 125%;
    line-height: 1.2em;
    font-weight: bold;
}

.sidebar-top-image {
    padding: 0.4em;
}

.sidebar-top-caption,
.sidebar-pretitle-with-top-image,
.sidebar-caption {
    padding: 0.2em 0.4em 0;
    line-height: 1.2em;
}

.sidebar-pretitle {
    padding: 0.4em 0.4em 0;
    line-height: 1.2em;
}

.sidebar-title,
.sidebar-title-with-pretitle {
    padding: 0.2em 0.8em;
    font-size: 145%;
    line-height: 1.2em;
}

.sidebar-title-with-pretitle {
    padding: 0.1em 0.4em;
}

.sidebar-image {
    padding: 0.2em 0.4em 0.4em;
}

.sidebar-heading {
    padding: 0.1em 0.4em;
}

.sidebar-content {
    padding: 0 0.5em 0.4em;
}

.sidebar-content-with-subgroup {
    padding: 0.1em 0.4em 0.2em;
}

.sidebar-above,
.sidebar-below {
    padding: 0.3em 0.8em;
    font-weight: bold;
}

.sidebar-collapse .sidebar-above,
.sidebar-collapse .sidebar-below {
    border-top: 1px solid #aaa;
    border-bottom: 1px solid #aaa;
}

.sidebar-navbar {
    text-align: right;
    font-size: 115%;
    padding: 0 0.4em 0.4em;
}

.sidebar-list-title {
    padding: 0 0.4em;
    text-align: left;
    font-weight: bold;
    line-height: 1.6em;
    font-size: 105%;
}

/* centered text with mw-collapsible headers is finicky */
.sidebar-list-title-c {
    padding: 0 0.4em;
    text-align: center;
    margin: 0 3.3em;
}

@media (max-width: 720px) {
    /* users have wide latitude to set arbitrary width and margin :(
       "Super-specific" selector to prevent overriding this appearance by
       lower level sidebars too */
    body.mediawiki .sidebar {
        width: 100% !important;
        clear: both;
        float: none !important; /* Remove when we div based; Minerva is dumb */
        margin-left: 0 !important;
        margin-right: 0 !important;
    }
    /* TODO: We might consider making all links wrap at small resolutions and then
     * only introduce nowrap at higher resolutions. Do when we invert the media
     * query.
     */
}