body {
    padding: 20px;
    background-color: #444;
}
gridContainer {
    padding-bottom: 10px;
}
/*
 -- this is comment by FvdV, 2017-02-23 --
    using canvas should enhance performance
    find out how !!
*/
table {
    background-color: gray;
    border-spacing: 0px;
}
td {
    border: 1px solid rgb(90, 90, 90);
    width: 10px;
    height: 10px;
}
td.dead {
    background-color: transparent;
}
td.live {
    background-color: gold;
}