*{
       box-sizing: border-box;
}

div.column {
        float: left;
        width: 50%;
}

div#humanDice, div#computerDice {
        font-size: 0;
}

div#humanDice > img, div#computerDice > img {
        width: calc(100% / 6);
}

table {
        border-collapse: collapse;
        width: 100%;
}

table, tr, td {
        border: 1px solid black;
}

div.column {
        background:darkgrey;
            float: left;
                width: 50%;
}

body
{background: lightblue;
}