.selector {
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    cursor: pointer;
    display: inline-block;
    padding: 5px 9px;
    margin: 5px;
    min-width: 25px;
    min-height: 25px;
    border-radius: 5px;
}

 .selector.selected .fa{
    color: #FFEB3B;
}
 .selector.un-selected .fa{
    color: #fff;
}

 .selector.selected {
    background: green;
    color: #fff;
}

 .selector.un-selected {
    background: #414240;
    color: #fff;
}