Module:Random slideshow/sandbox/styles.css

/* Hide the toggle gallery button */
.randomSlideshow-container > .gallery.mw-gallery-slideshow > .gallerycarousel > div > div > div > span:nth-child(2)  {
	display: none;
}

/* Visually hide the labels' text content, but retain screenreader access (hopefully) */
.randomSlideshow-container .randomSlideshow-sr-only {
	display:block;
	width:1px;
	height:1px;
	text-indent:-999px;
	overflow:hidden;
}

/*******************************************************************************
 * MOBILE-ONLY STYLES
 *******************************************************************************
 * Mobile-only can targeted by prefixing these selectors:
 *
 *    .randomSlideshow-container ul.gallery:first-child
 *
 * This is becaue the div with class "nomobile" only gets included in the html
 * for the desktop website, and not on mobile (except in Template namespace).
 ******************************************************************************/

/* Make labels sit side-by-side */
.randomSlideshow-container ul.gallery:first-child label {
	display:inline-block !important; /* overrides inline style */
	padding:0.2em 0.3em;
}

/* Position the radio input in the center */
.randomSlideshow-container ul.gallery:first-child label,
.randomSlideshow-container ul.gallery:first-child input {
	vertical-align: middle;
}
/* Make radio inputs bigger */
.randomSlideshow-container ul.gallery:first-child input {
	transform: scale(1.4)
}

/* Hide the "Show all" option */
.randomSlideshow-container ul.gallery:first-child label:last-child {
	display:none !important; /* overrides inline style */
}

.randomSlideshow-container ul.gallery:first-child .gallerybox {
	/* Make sure the labels are underneath not alongside the gallery */
	display:block;
	/* Center gallery items within the gallery container */
	margin: auto;
}

/* Remove excess padding around captions */
.randomSlideshow-container ul.gallery:first-child .gallerybox li,
.randomSlideshow-container ul.gallery:first-child .gallerybox div,
.randomSlideshow-container ul.gallery:first-child .gallerybox p {
	padding-top:0;
	padding-bottom:0;
	margin:0;
}

/* Center the gallery within its container */
.randomSlideshow-container ul.gallery.mw-gallery-slideshow:first-child {
    position: relative;
    left: 50%;
    transform: translateX(-50%);
    display: inline-block; /* fallback */
    text-align:center; /* fallback: place the radio inputs in the center */
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}
/* Place radio inputs at the top, and gallery contents below */
.randomSlideshow-container ul.gallery:first-child .gallerybox {
	order: 99999;
	flex-shrink: 0;
}
.randomSlideshow-container ul.gallery:first-child label {
	flex: 0 0;
}

/* Allow descriptions to take up the full width of the container */
.randomSlideshow-container ul.gallery:first-child .gallerybox {
	width: 100% !important; /* overrides inline style */
}
.randomSlideshow-container ul.gallery:first-child .gallerybox > div,
.randomSlideshow-container ul.gallery:first-child .gallerybox > div > div {
	width: inherit !important; /* overrides inline style */
	max-width: 100%;
	text-align: center;
}

/*******************************************************************************
 * DESKTOP-ONLY STYLES
 *******************************************************************************
 * Desktop-only can targeted by prefixing these selectors:
 *
 *    .randomSlideshow-container .nomobile+ul
 *
 * This is becaue the div with class "nomobile" only gets included in the html
 * for the desktop website, and not on mobile (except in Template namespace).
 ******************************************************************************/

/* Hide all the switcher labels */
.randomSlideshow-container .nomobile+ul label {
	display:none !important; /* overrides inline style */
}