*{
    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);
}

div#computerDice {
    //
}

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

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