Voir la source de Module:Message box/ombox.css

/* {{pp|small=y}} */
.ombox {
	margin: 4px 0;
	border-collapse: collapse;
	border: 1px solid #a2a9b1;    /* Default "notice" gray */
	background-color: var(--background-color-neutral-subtle, #f8f9fa);
	box-sizing: border-box;
    color: var(--color-base, #202122);
}

/* For the "small=yes" option. */
.ombox.mbox-small {
	font-size: 88%;
	line-height: 1.25em;
}

.ombox-speedy {
	border: 2px solid #b32424;    /* Red */
	background-color: #fee7e6;    /* Pink */
}

.ombox-delete {
	border: 2px solid #b32424;    /* Red */
}

.ombox-content {
	border: 1px solid #f28500;    /* Orange */
}

.ombox-style {
	border: 1px solid #fc3;       /* Yellow */
}

.ombox-move {
	border: 1px solid #9932cc;    /* Purple */
}

.ombox-protection {
	border: 2px solid #a2a9b1;    /* Gray-gold */
}

.ombox .mbox-text {
	border: none;
	/* @noflip */
	padding: 0.25em 0.9em;
	width: 100%;
}

.ombox .mbox-image {
	border: none;
	/* @noflip */
	padding: 2px 0 2px 0.9em;
	text-align: center;
}

.ombox .mbox-imageright {
	border: none;
	/* @noflip */
	padding: 2px 0.9em 2px 0;
	text-align: center;
}

/* An empty narrow cell */
.ombox .mbox-empty-cell {
	border: none;
	padding: 0;
	width: 1px;
}

.ombox .mbox-invalid-type {
	text-align: center;
}

@media (min-width: 720px) {
	.ombox {
		margin: 4px 10%;
	}
	
	.ombox.mbox-small {
		/* @noflip */
		clear: right;
		/* @noflip */
		float: right;
		/* @noflip */
		margin: 4px 0 4px 1em;
		width: 238px;
	}
}

/** T367463 */
body.skin--responsive table.ombox img {
	max-width: none !important;
}

@media screen {
	html.skin-theme-clientpref-night .ombox-speedy {
		background-color: #310402;    /* Dark red, same hue/saturation as light */
	}
}

@media screen and (prefers-color-scheme: dark) {
	html.skin-theme-clientpref-os .ombox-speedy {
		background-color: #310402; /* Dark red, same hue/saturation as light */
	}
}