div{ width: 100px; height: 100px; border: 100px solid black; border-left-color:darkcyan; border-right-color: rgb(255,157); border-top-color:royalblue; border-bottom-color: blueviolet; }
div{ width: 0; height: 0; border: 100px solid black; border-left-color:coral; border-right-color:transparent; border-top-color:transparent; border-bottom-color:coral; }
Transparent