<canvas id="bgCanvas" style="z-index: 0; position:absolute; left:0px; top:0px;" width="800" height="1280"></canvas>
<canvas id="mainCanvas" style="z-index: 1; position:absolute; left:0px; top:0px;" width="800" height="1280"></canvas>
<canvas id="buttonCanvas" style="z-index: 2; position:absolute; left:0px; top:0px;" width="800" height="1280"></canvas>
+ <canvas id="callCanvas" style="z-index: 3; position:absolute; left:0px; top:0px;" width="800" height="1280"></canvas>
<canvas id="mouseClicks" style="z-index: 100; position:absolute; left:0px; top:0px;" width="800" height="1280"></canvas>
</body>