src/vs/base/browser/ui/selectBox/selectBoxCustom.ts/SelectBoxList/styleList
class SelectBoxList:	private styleList() {
		if (this.selectList) {
			const background = this.styles.selectBackground ? this.styles.selectBackground.toString() : '';
			this.selectList.style({});

			const listBackground = this.styles.selectListBackground ? this.styles.selectListBackground.toString() : background;
			this.selectDropDownListContainer.style.backgroundColor = listBackground;
			this.selectionDetailsPane.style.backgroundColor = listBackground;
			const optionsBorder = this.styles.focusBorder ? this.styles.focusBorder.toString() : '';
			this.selectDropDownContainer.style.outlineColor = optionsBorder;
			this.selectDropDownContainer.style.outlineOffset = '-1px';
		}
	}