Editing Module:Message box/imbox.css

/* {{pp|small=y}} */
.imbox {
	margin: 4px 0;
	border-collapse: collapse;
	border: 3px solid #36c;    /* Default "notice" blue */
	background-color: var(--background-color-interactive-subtle, #f8f9fa); 
	box-sizing: border-box;
}

/* For imboxes inside imbox-text cells. */
.imbox .mbox-text .imbox {
	margin: 0 -0.5em; /* 0.9 - 0.5 = 0.4em left/right. */
	/* TODO: Still needed? */
	display: block; /* Fix for webkit to force 100% width.  */
}

.imbox-speedy {
	border: 3px solid #b32424;    /* Red */
	background-color: #fee7e6;    /* Pink */
}

.imbox-delete {
	border: 3px solid #b32424;    /* Red */
}

.imbox-content {
	border: 3px solid #f28500;    /* Orange */
}

.imbox-style {
	border: 3px solid #fc3;       /* Yellow */
}

.imbox-move {
	border: 3px solid #9932cc;    /* Purple */
}

.imbox-protection {
	border: 3px solid #a2a9b1;    /* Gray-gold */
}

.imbox-license {
	border: 3px solid #88a;       /* Dark gray */
}

.imbox-featured {
	border: 3px solid #cba135;    /* Brown-gold */
}

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

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

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

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

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

@media (min-width: 720px) {
	.imbox {
		margin: 4px 10%;
	}
}


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


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