canvas {
    position: absolute
}

.mycan {
    width: 800px;
    height: 480px;
}

#hebican {
    z-index: 3
}

#canvas {
    z-index: 2
}

#myCanvas {
    z-index: 1
}

.foods{
    z-index: 4;
    width: 800px;
    height: 480px;
    position: absolute;
}

.oneFood{
    position: absolute;
    width: 20px;
    height: 20px;
    background:url(1f414.png) no-repeat;
    background-size:100% 100%;
}