View source for Template:Nmbox/styles.css

.nmbox {
	/* clear: both; */
	background: #f8f9fa;
	border: 1px solid #AAA;
	box-sizing: border-box;
	margin: 2px 0;
	padding: 0;
}
.nmbox * {
	box-sizing: border-box;
}
.nmbox-header {
	background: #eaecf0;
	padding: 4px 0.5em;
	font-weight: bold;
	text-align: center;
	white-space: nowrap
}
.nmbox .mbox-image {
	display: inline-block;
	padding-right: 1em;
}
.nmbox-text {
	border-top: 1px solid #AAA;
	width: 100%;
	padding: 4px 0.5em;
}
@media screen and (min-width: 768px) {
	.nmbox-header {
		display: table-cell;
		border-right: 1px solid #AAA;
		width: 1%;
	}
	.nmbox-text {
		border-top: none;
		display: table-cell;
	}
}

@media screen {
	html.skin-theme-clientpref-night .nmbox-header,
	html.skin-theme-clientpref-night  .nmbox {
	    background: transparent;
	    color: inherit;
	}
}

@media screen and (prefers-color-scheme: dark) {
    /* automatic mode */
    html.skin-theme-clientpref-os .nmbox-header,
    html.skin-theme-clientpref-os  .nmbox {
    	background: transparent;
    	color: inherit;
    }
}