ui/styles.css

.tic-row {
    display: flex !important;
    flex-direction: row !important;
    flex-wrap: nowrap !important;
    justify-content: center !important;
}

.tic-cell {
    flex: 1 0 0 !important;            
    max-width: 120px !important;       
}

.tic-btn {
    width: 100% !important;
    height: 100px !important;          
    font-size: 40px !important;
    padding: 0 !important;
    text-align: center !important;
}