src/vs/base/browser/ui/inputbox/inputBox.ts/InputBox/applyStyles
class InputBox:	protected applyStyles(): void {
		const background = this.inputBackground ? this.inputBackground.toString() : '';
		const foreground = this.inputForeground ? this.inputForeground.toString() : '';
		const border = this.inputBorder ? this.inputBorder.toString() : '';

		this.element.style.backgroundColor = background;
		this.element.style.color = foreground;
		this.input.style.backgroundColor = 'inherit';
		this.input.style.color = foreground;

		this.element.style.borderWidth = border ? '1px' : '';
		this.element.style.borderStyle = border ? 'solid' : '';
		this.element.style.borderColor = border;
	}