.r{
    background: rgba(255, 0, 0, 0.3) !important;
}

.g{
    background: rgba(0, 128, 0, 0.3) !important;
}

.b{
    background: rgba(0, 0, 255, 0.3) !important;
}

.y{
    background: rgba(255, 255, 0, 0.4) !important;
}