#keuze1, #keuze2, #keuze3, #keuze4 {width:50px; height: 50px; color:rgba(0, 0, 0, 0);border-radius: 25px;}

#keuze1:focus, #keuze2:focus, #keuze3:focus, #keuze4:focus{
   color:black;
}

.zwart {background:black;color:black;}
.oranje {background:orange;}
.roze {background:pink;}
.groen {background:green;}
.rood {background:red;}
.blauw {background:blue;}