1.Border radius

The border-radius property can be used to

working clockwise from top-left set border-top-left-radius/border-top-right-radius/border-bottom-right-radius/border-bottom-left-radius　　　　　　　

-webkit-border-radius and -moz-border-radius ,old browser　　

2.border-radius: 50px/100px;

specify different horizontal and vertical radiiii by splitting values with a “/”.