View source for Template:Note/styles.css

.note {
	display: inline-block;
	width: auto;
	min-width: 30%;
	max-width: 90%;
	background-position: left 7px top 50%;
	padding: 0.7em 1.2em 0.7em 40px;
	margin: 0.5em auto;
	text-align: initial;
	overflow: hidden;
	background-color: #f8f9fa;
	background-repeat: no-repeat;
	border-left: 5px solid #ddd;
	border-radius: 3px;
}

.note-wrapper {
	text-align: center;
}

.note-inline {
	display: inline-block;
	vertical-align: middle;
}
.note-info {
	background-color: #dbecff;
	/* [[File:OOjs_UI_icon_reference-invert.svg]] */
	background-image: url(https://upload.wikimedia.org/wikipedia/commons/d/d5/OOjs_UI_icon_reference-invert.svg);
	background-size: 25px;
	border-color: #387ecf;
	padding-left: 40px;
}
.note-reminder {
	background-color: #fff4d1;
	/* [[File:OOjs_UI_icon_lightbulb-yellow.svg]] */
	background-image: url(https://upload.wikimedia.org/wikipedia/commons/a/a8/OOjs_UI_icon_lightbulb-yellow.svg);
	background-size: 25px;
	border-color: #fc3;
}
.note-warn {
	background-color: #ffe6c4;
	/* [[File:OOjs_UI_icon_alert-warning.svg]] */
	background-image: url(https://upload.wikimedia.org/wikipedia/commons/3/3b/OOjs_UI_icon_alert-warning.svg);
	background-size: 25px;
	border-color: #ffa733;
}

.note-error {
	background-color: #fab8af;
	/* [[File:OOjs_UI_icon_notice-destructive.svg]] */
	background-image: url(https://upload.wikimedia.org/wikipedia/commons/b/bf/OOjs_UI_icon_notice-destructive.svg);
	background-size: 25px;
	border-color: #c33;
}