woocommerce/plugins/woocommerce-admin/client/header/activity-panel/highlight-tooltip/style.scss

.highlight-tooltip__container {
	position: absolute;
	width: 0;
	height: 0;
	&.highlight-tooltip__show {
		top: 0;
		left: 0;
		width: 100%;
		height: 100%;
	}
}
.highlight-tooltip__portal {
	width: 100%;
	height: 100%;
	position: relative;

	.highlight-tooltip__overlay {
		position: fixed;
		top: 0;
		right: 0;
		bottom: 0;
		left: 0;
		background-color: rgba($black, 0.35);
		z-index: z-index('.components-modal__screen-overlay');

		@include edit-post__fade-in-animation();
	}
}

.highlight-tooltip__popover {
	.components-card {
		min-width: 360px;
	}
	.components-card__header {
		@include font-size( 16 );
		font-weight: 600;
		box-sizing: border-box;
	}
	.components-card__footer {
		justify-content: flex-end;
		box-sizing: border-box;
	}
}