div.grid {
    display: inline-block;
}


.grid div {
    -webkit-transition: background-color 0.1s ease-out;
    -moz-transition: background-color 0.1s ease-out;
    -o-transition: background-color 0.1s ease-out;
    transition: background-color 0.1s ease-out;
}

.gridCell > div > div {
    height: 20px;
    width: 20px;
    margin: 2px;
    display: inline-block;
}

.smallGridCell > div > div {
    height: 15px;
    width: 15px;
    margin: 1px;
    display: inline-block;
}

.gridRow > div {
    height: 24px;
    text-align: center;
}

.smallGridRow > div {
    height: 17px;
    text-align: center;
}