View source for Portal pictures/sandbox/style.css

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

/* Reduce spacing around buttons */
div.portalSlideshow-container > ul.gallery.mw-gallery-slideshow > li.gallerycarousel > div > div:nth-child(1)  {
	padding-top: 0.3em;
	padding-bottom: 0;
}

/* --- Rules for when gallerycarousel isn't present (i.e. mobile website) --- */
/* only show the first item (if on desktop site, this is just the gallerycarousel) */
div.portalSlideshow-container > ul.gallery.mw-gallery-slideshow > li:nth-child(n+2) {
	display: none;
}

/* use the full available width */
div.portalSlideshow-container .gallery .gallerybox,
div.portalSlideshow-container .gallery .gallerybox div {
	width:100% !important; /* overrides inline style */
	max-width:100%;
}

/* Hide only the blank placeholder image */
.mw-gallery-slideshow-img-container > a[href="/wiki/File:Blank.png"] {
	display: none;
}

/* fixes for default slideshow CSS */
.gallerytext {
	font-size: 100% !important;
	text-align: left;
}