table {
    background: #EEE;
    border-collapse: separate;
    text-align: left;
}

.board-cell {
    border-right: 1px solid #fff;
    border-left: 1px solid #e8e8e8;
    border-top: 1px solid #fff;
    border-bottom: 1px solid #e8e8e8;
    transition: all 250ms;
}

.board-cell:hover {
    background-color: #AAA;
}

.clicked {
    background-color: white;
}

#modal button {
    width: 33%;
}
table {
    background: #EEE;
    border-collapse: separate;
    text-align: left;
}

.board-cell {
    border-right: 1px solid #fff;
    border-left: 1px solid #e8e8e8;
    border-top: 1px solid #fff;
    border-bottom: 1px solid #e8e8e8;
    transition: all 250ms;
}

.board-cell:hover {
    background-color: #AAA;
}

.clicked {
    background-color: white;
}

.clicked:hover {
    background-color: white;
}

#modal button {
    width: 33%;
}
Fix colour change on hover
Fix colour change on hover
