#simon {
    height: 50px;
    width: 50px;
    background-color: black;
    border-radius : 50%;
    border-left: 200px solid rgba(255,0,0,0.4);
    border-top: 200px solid rgba(0,255,0,0.4);
    border-right: 200px solid rgba(0,0,255,0.4);
    border-bottom: 200px solid rgba(255,255,0,0.4);
    transition:0.4s;
}