css circle border

.circle {
    background-color:#fff;
    border:1px solid red;    
    height:100px;
    border-radius:50%;
    -moz-border-radius:50%;
    -webkit-border-radius:50%;
    width:100px;
}
<div class="circle"></div>#rcorners {
  border-radius: 25px;
}.div { /*Top Left (TL) Top Right (TR) Bottom Right (BR) Bottom Left (BL)*/
	border-radius: 15px 50px 30px 5px; /*TL TR BR BL*/
  	border-radius: 15px 50px 30px; /*TL TRBL BR*/
  	border-radius: 15px 50px; /*TLBR TRBL*/
  	border-radius: 15px; /*All corners*/
}