cellular-elm/style.css

#background {
    width:500px;
    height:200px;
    overflow:hidden;
}

.cell {
    width:10px;
    height:10px;
}

.alive {
    //background-color:#000000;
    background-color:lightblue;
}
.dead {
    //background-color:#cccccc;
    background-color:yellow;
}