woocommerce/packages/js/components/src/experimental-select-control/combo-box.scss

.woocommerce-experimental-select-control__combo-box-wrapper {
	cursor: text;
	border: 1px solid $studio-gray-20;
	border-radius: 2px;
	background: $studio-white;
	position: relative;
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	padding: $gap-smallest 36px $gap-smallest $gap-smaller;
	margin-bottom: 4px;

	> * {
		display: inline-flex;
	}
}

.woocommerce-experimental-select-control__combox-box {
	flex-grow: 1;
	align-items: center;
	flex-basis: 120px;
	display: inline-flex;

	input {
		width: 100%;
		margin-top: 2px;
		margin-bottom: 2px;
		font-size: 13px;
	}
}

.woocommerce-experimental-select-control__combox-box-icon {
	position: absolute;
	right: 6px;
	top: 50%;
	transform: translateY( -50% );
}