ImageGrid/Viewer/css/widget/overlay.css

.overlay-widget {
	position: absolute;

	width: 100%;
	height: 100%;
	top: 0px;
	left: 0px;

	overflow: hidden;

	background: rgba(0, 0, 0, 0.5);

	backdrop-filter: blur(2px) saturate(0.3);

	-webkit-transform-style: preserve-3d;
	-moz-transform-style: preserve-3d;
	transform-style: preserve-3d;

	/* XXX try to avoid this... */
	z-index: 5000;
}
.overlay-widget~.overlay-widget {
	background: rgba(0, 0, 0, 0.3);
}


.overlay-widget .content {
	position: relative;
	display: inline-block;

	top: 50%;
	left: 50%;

	width: auto;
	height: auto;

	min-width: 200px;
	max-width: 80vw;
	max-height: 90vh;

	/*overflow: hidden;*/

	transform: translateY(-50%) translateX(-50%);

	box-shadow: rgba(0, 0, 0, 0.1) 0.3em 0.3em 5em;
}
.overlay-widget~.overlay-widget .content {
	box-shadow: rgba(0, 0, 0, 0.05) 0.1em 0.1em 3em;
}

/* title */
.content>*:before {
	position: absolute;
	content: attr(dialog-title);

	bottom: 100%;

	color: silver;

	font-weight: 900;
	font-style: italic;
	font-size: x-large;
	line-height: 85%;

	opacity: 0.6;
}