.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>
.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*/ }
#rcorners { border-radius: 25px; }