src/vs/base/browser/ui/keybindingLabel/keybindingLabel.ts/KeybindingLabel/applyStyles
class KeybindingLabel:	private applyStyles() {
		if (this.element) {
			for (const keyElement of this.keyElements) {
				if (this.labelBackground) {
					keyElement.style.backgroundColor = this.labelBackground?.toString();
				}
				if (this.labelBorder) {
					keyElement.style.borderColor = this.labelBorder.toString();
				}
				if (this.labelBottomBorder) {
					keyElement.style.borderBottomColor = this.labelBottomBorder.toString();
				}
				if (this.labelShadow) {
					keyElement.style.boxShadow = `inset 0 -1px 0 ${this.labelShadow}`;
				}
			}

			if (this.labelForeground) {
				this.element.style.color = this.labelForeground.toString();
			}
		}
	}