✏ EDIT: wp-tooltip.css

/* Accessible tooltip component. Markup from wp_get_tooltip(). */

.wp-tooltip {
	display: inline-flex;
	align-items: center;
}

/* Toggle and close buttons. */
.wp-tooltip .wp-tooltip__toggle,
.wp-tooltip .wp-tooltip__close {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 24px;
	height: 24px;
	padding: 0;
	border: 0;
	border-radius: 2px;
	background: none;
	color: #50575e;
	cursor: pointer;
}

.wp-tooltip:not(:has(button[aria-disabled="true"],button[disabled])) .wp-tooltip__toggle:hover,
.wp-tooltip:not(:has(button[aria-disabled="true"],button[disabled])) .wp-tooltip__toggle:focus,
.wp-tooltip .wp-tooltip__close:hover,
.wp-tooltip .wp-tooltip__close:focus {
	color: var(--wp-admin-theme-color, #3858e9);
}

/*
 * `:where()` keeps the wrapper out of the specificity total, so buttons
 * passed into a tooltip keep control of their own focus ring.
 */
:where(.wp-tooltip:not(:has(button[aria-disabled="true"],button[disabled]))) .wp-tooltip__toggle:focus,
.wp-tooltip .wp-tooltip__close:focus {
	outline: 2px solid transparent;
	box-shadow: 0 0 0 var(--wp-admin-border-width-focus, 1.5px) var(--wp-admin-theme-color, #3858e9);
}

.wp-tooltip .wp-tooltip__toggle .dashicons {
	width: 20px;
	height: 20px;
	font-size: 20px;
}

.wp-tooltip .wp-tooltip__close .dashicons {
	width: 18px;
	height: 18px;
	font-size: 18px;
}

/* Bubble. No position here, so it falls back to the UA's centered popover without anchoring. */
.wp-tooltip .wp-tooltip__bubble {
	max-width: min(280px, calc(100vw - 32px));
	margin: auto;
	padding: 12px 16px;
	overflow: visible;
	border: 1px solid #c3c4c7;
	border-radius: 4px;
	background: #fff;
	color: #1d2327;
	font-size: 13px;
	font-weight: 400;
	line-height: 1.5;
	text-align: left;
	box-shadow: 0 3px 6px rgba(0, 0, 0, 0.08);
}

.wp-tooltip.wp-is-tooltip .wp-tooltip__bubble {
	background: #000;
	color: #f0f0f0;
	text-align: center;
	padding: 4px 8px;
	line-height: 1.4;
}

.wp-tooltip:not(.wp-is-tooltip) .wp-tooltip__text {
	display: block;
	padding-inline-end: 24px;
}

.wp-tooltip .wp-tooltip__close {
	position: absolute;
	top: 6px;
	inset-inline-end: 6px;
}

/* Anchor the bubble above its toggle, with a downward arrow. */
@supports (anchor-name: --a) {
	.wp-tooltip .wp-tooltip__bubble {
		position-area: top;
		margin: 0 0 8px;
		position-try-fallbacks: flip-block, flip-inline;
	}

.wp-tooltip.wp-is-tooltip .wp-tooltip__bubble {
		margin: 0;
	}

/* Arrow: gray border (::before) under a white fill (::after). */
	.wp-tooltip:not(.wp-is-tooltip) .wp-tooltip__bubble::before,
	.wp-tooltip:not(.wp-is-tooltip) .wp-tooltip__bubble::after {
		content: "";
		position: absolute;
		top: 100%;
		left: 50%;
		width: 0;
		height: 0;
		border: 8px solid transparent;
		border-bottom: 0;
	}

.wp-tooltip:not(.wp-is-tooltip) .wp-tooltip__bubble::before {
		margin-left: -8px;
		border-top-color: #c3c4c7;
	}

.wp-tooltip:not(.wp-is-tooltip) .wp-tooltip__bubble::after {
		margin-left: -7px;
		border-width: 7px;
		border-bottom: 0;
		border-top-color: #fff;
	}
}

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