src/vs/base/browser/ui/selectBox/selectBoxCustom.ts/SelectBoxList/applyStyles
class SelectBoxList:	public applyStyles(): void {

		// Style parent select

		if (this.selectElement) {
			const background = this.styles.selectBackground ? this.styles.selectBackground.toString() : '';
			const foreground = this.styles.selectForeground ? this.styles.selectForeground.toString() : '';
			const border = this.styles.selectBorder ? this.styles.selectBorder.toString() : '';

			this.selectElement.style.backgroundColor = background;
			this.selectElement.style.color = foreground;
			this.selectElement.style.borderColor = border;
		}

		// Style drop down select list (non-native mode only)

		if (this.selectList) {
			this.styleList();
		}
	}