<canvas id="canvas"><div class="box" id="box-1-1"></div><div class="box" id="box-2-1"></div><div class="box" id="box-1-2"></div><div class="box" id="box-2-2"></div><div class="box" id="box-1-3"></div><div class="box" id="box-2-3"></div></canvas>
and style:

div.box {
    background-color: rgb(128, 128, 128);
    background-image: url("./img/empty.png");
    width: 40px;
    height: 40px;
    float: left;
    margin: 4px;
    border-radius: 4px;
    border: 1px solid rgb(0, 0, 0);
	}