woocommerce/packages/woocommerce-blocks/assets/js/base/components/dropdown-selector/style.scss

// 18px is the minimum input field line-height and 14px is the font-size of
// the drop down selector elements.

$dropdown-selector-line-height: math.div(18, 14);

.wc-block-components-dropdown-selector {
	max-width: 300px;
	position: relative;
	width: 100%;
}

.wc-block-components-dropdown-selector__input-wrapper {
	background: #fff;
	border: 1px solid $input-border-gray;
	color: $input-text-active;
	align-items: center;
	border-radius: 4px;
	cursor: text;
	display: flex;
	flex-wrap: wrap;
	padding: 2px $gap-smaller;

	.is-disabled & {
		background-color: $gray-200;
	}

	.is-multiple.has-checked > & {
		padding: 2px $gap-smallest;
	}

	.is-open > & {
		border-radius: 4px 4px 0 0;
	}
}

.wc-block-components-dropdown-selector__input {
	@include font-size(small);
	line-height: $dropdown-selector-line-height;
	margin: em($gap-small*0.25) 0;
	min-width: 0;
	padding: em($gap-smallest * 0.75) 0 em($gap-smallest * 0.75);

	.is-single & {
		width: 100%;

		&:hover,
		&:focus,
		&:active {
			outline: 0;
		}
	}

	.is-single.has-checked.is-open & {
		margin-bottom: 1.5px;
		margin-top: 1.5px;
	}

	.is-single.has-checked:not(.is-open) & {
		@include visually-hidden();
		// Fixes an issue in Firefox that `flex: wrap` in the container was making
		// this element to still occupy one line.
		position: absolute;
	}

	.is-multiple & {
		flex: 1;
		min-width: 0;
	}
}

// Visually hide the input
.is-single .wc-block-components-dropdown-selector__input:first-child,
.is-multiple .wc-block-components-dropdown-selector__input {
	background: transparent;
	border: 0;

	&:hover,
	&:focus,
	&:active {
		outline: 0;
	}
}

.wc-block-components-dropdown-selector {
	// Reset <button> styles
	.wc-block-components-dropdown-selector__selected-value__label,
	.wc-block-components-dropdown-selector__selected-value__remove {
		background-color: transparent;
		border: 0;
		color: inherit;
		font-size: inherit;
		font-weight: inherit;
		text-transform: initial;

		&:hover,
		&:focus,
		&:active {
			background-color: transparent;
			text-decoration: none;
		}
	}

	.wc-block-components-dropdown-selector__selected-value {
		@include font-size(small);
		align-items: center;
		color: $gray-700;
		display: inline-flex;
		margin: em($gap-small*0.25) 0;
		padding: em($gap-smallest * 0.75) 0 em($gap-smallest * 0.75);
		width: 100%;
	}

	.wc-block-components-dropdown-selector__selected-value__label {
		flex-grow: 1;
		line-height: $dropdown-selector-line-height;
		padding: 0;
		text-align: left;
	}

	.wc-block-components-dropdown-selector__selected-value__remove {
		background-color: transparent;
		border: 0;
		display: inline-block;
		line-height: 1;
		padding: 0 0 0 0.3em;

		> svg {
			display: block;
		}
	}

	.wc-block-components-dropdown-selector__selected-chip {
		@include font-size(small);
		margin-top: em($gap-small*0.25);
		margin-bottom: em($gap-small*0.25);
		line-height: $dropdown-selector-line-height;
	}
}

.wc-block-components-dropdown-selector__list {
	background-color: #fff;
	margin: -1px 0 0;
	padding: 0;
	position: absolute;
	left: 0;
	right: 0;
	top: 100%;
	max-height: 300px;
	overflow-y: auto;
	z-index: 1;

	&:not(:empty) {
		border: 1px solid #9f9f9f;
	}
}

.wc-block-components-dropdown-selector__list-item {
	@include font-size(small);
	color: $gray-700;
	cursor: default;
	list-style: none;
	margin: 0;
	padding: 0 $gap-smallest;

	&.is-selected {
		background-color: $gray-300;
	}

	&:hover,
	&:focus,
	&.is-highlighted,
	&:active {
		background-color: #00669e;
		color: #fff;
	}
}