span {
    display: inline-block;
    width: 50px;
    height: 50px;
    font-size: 50px;
    line-height: 50px;
    background-color: #cdc1b4;
    text-align: center;
    vertical-align: top;
    margin: 2px;
}

div {
    background-color: #FFFFFF;
}