input[type=button]:active, a:active {
    border: 5px solid rgb(0,0,0,0.5);
    color: rgb(0,0,0,0.5);
    background-color: rgb(255,255,255);
}

input[type=text]:active {
    background-color: rgb(255,255,255, 0.6);
}

select:active {
    background-color: rgb(255,255,255, 0.6);
}

.activo {
    background-color: rgb(255,255,255, 0.6); 
}