can I change the color of the background black of letterbox

Hello (excuse my english),

how can I change the color of the background or two black bars of letterbox ?

Thank you.

you can change the background color on your layers. the color of the letterbox can change by editing the index.html of your game. the style entry of body background. #000 = black #fff = white

		body {
			background: #000;
			color: #fff;
			overflow: hidden;
			-ms-touch-action: none;
		}[/code:2sdwko79]

Thank you very much !