Module:Mbox/styles.css

.mbox {
	position: relative;
	display: flex;
	flex-direction: column;
	margin-top: var(--space-xs);
	margin-bottom: var(--space-md);
	background-color: var(--color-surface-2);
	border-radius: var(--border-radius--medium);
	color: var(--color-base--subtle);
	font-size: 0.875rem;
	line-height: var(--line-height-xs);
}

.mbox.mbox-high {
    background-color: var(--background-color-destructive);
}

.mbox.mbox-med {
	background-color: var(--background-color-warning);
}

.mbox-title {
	display: flex;
	align-items: center;
	padding: var(--space-sm) var(--space-md);
}

.mbox-title a {
	padding-left: 4px;
	padding-right: 4px;
}

.mbox-icon img {
	width: 14px;
	height: auto;
	margin-right: var(--space-xs);
	opacity: 0.5;
}

.mbox-text {
	position: absolute;
	top: 100%;
	z-index: 10;
	padding: var(--space-md);
	width: 100%;
    box-sizing: border-box;
	background-color: var(--color-surface-1);
	border-bottom-left-radius: var(--border-radius--medium);
	border-bottom-right-radius: var(--border-radius--medium);
	box-shadow: var(--box-shadow-dialog);
	opacity: 0;
	visibility: hidden;
}

.mbox:hover {
	/* Merge with popup */
	border-bottom-left-radius: 0;
	border-bottom-right-radius: 0;
	box-shadow: var( --box-shadow-dialog );
}

.mbox:hover .mbox-text {
	opacity: 1;
	visibility: visible;
}

/* Light mode */
html.skin-citizen-light .mbox-icon img {
	filter: invert( 1 );
}