Module:Infobox/styles.css

/* {{pp|small=y}} */
/*
 * This TemplateStyles sheet deliberately does NOT include the full set of
 * infobox styles. We are still working to migrate all of the manual
 * infoboxes. See [[MediaWiki talk:Common.css/to do#Infobox]]
 * DO NOT ADD THEM HERE
 */
/*
 * not strictly certain these styles are necessary since the modules now
 * exclusively output infobox-subbox or infobox, not both
 * just replicating the module faithfully
 */
.infobox-subbox {
 padding: 0;
 border: none;
 margin: -3px;
 width: auto;
 min-width: 100%;
 font-size: 100%;
 clear: none;
 float: none;
 background-color: transparent;
}

.infobox-3cols-child {
 margin: auto;
}

.infobox .navbar {
 font-size: 100%;
}

/* T281642 */
body.skin-minerva .infobox-header,
body.skin-minerva .infobox-subheader,
body.skin-minerva  .infobox-above,
body.skin-minerva .infobox-title,
body.skin-minerva  .infobox-image,
body.skin-minerva  .infobox-full-data,
body.skin-minerva .infobox-below {
 text-align: center;
}


/* Dark theme: [[William_Wragg]], [[Coral_Castle]] */
html.skin-theme-clientpref-night .infobox-full-data div {
    background: #1f1f23 !important;
      /* switch with var( --color-base ) when supported. */
      color: #f8f9fa;
}

@media (prefers-color-scheme: dark) {
    html.skin-theme-clientpref-os .infobox-full-data div {
      background: #1f1f23 !important;
      /* switch with var( --color-base ) when supported. */
      color: #f8f9fa;
    }
}