JSFiddle - React, Tailwind, and code Playground

HTML

<body>

	<div id="container">
		<canvas id="canvas0" width=800 height=600></canvas>
		<canvas id="canvas1" width=800 height=600></canvas>
		<canvas id="canvas2" width=800 height=600></canvas>
		<canvas id="canvas3" width=800 height=600></canvas>
			<div id="menu">
				<button id="button1" type="button">Start</button>
				<button id="button2" type="button">Options</button>
				<button id="button3" type="button">High Scores</button>
			</div>
	</div>
	</body>

CSS

body {
	background-color: rgb(63,63,63);
}

#container {
	width: 800px;
	height: 600px;
	margin: 0 auto;
	position: relative;
    background: black;
}

canvas {
    position: absolute;
	top: 0;
	left: 0;
}

#cavas0 {z-index: 0;}
#canvas1 {z-index: 1;}
#canvas2 {z-index: 2;}
#canvas3 {z-index: 3;}

#menu {
	position: relative;
	width: 250px;
	height: 200px;
	z-index: 4;
	top: 200px;
	left: 275px;
}

button {
	width: 200px;
	height: 50px;	
	font-size: 20px;
	position: absolute;
	z-index: 5;
}

#button1 {
	left: 25px;
}

#button2 {
	left: 25px;
	top: 75px;
}

#button3 {
	left: 25px;
	top: 150px;
}