padding:10px; width:300px; height:50px; border: 5px solid #dedede; -moz-border-radius: 15px; /* Gecko browsers */ -webkit-border-radius: 15px; /* Webkit browsers */ border-radius:15px; /* W3C syntax */

例2：无边框

<div id="round"></div>  
#round {
    padding:10px; width:300px; height:50px;
    background:#FC9; 
    -moz-border-radius: 15px;
    -webkit-border-radius: 15px;
    border-radius:15px;
/* Gecko browsers */
-moz-border-radius: 5px; 
/* Webkit browsers */
-webkit-border-radius: 5px; 
/* W3C syntax - likely to be standard so use for future proofing */
border-radius:10px;
支持上、右、下、左
border-radius:5px 15px 20px 25px;
支持拆分书写
/* Gecko browsers */
-moz-border-radius-topleft: 20px;
-moz-border-radius-topright: 0;
-moz-border-radius-bottomleft: 0;
-moz-border-radius-bottomright: 20px;
/* Webkit browsers */
-webkit-border-top-left-radius: 20px;
-webkit-border-top-right-radius: 0;
-webkit-border-bottom-left-radius: 0;
-webkit-border-bottom-right-radius: 20px;
/* W3C syntax */
border-top-left-radius: 20px;
border-top-right-radius: 0;
border-bottom-right-radius: 0;
border-bottom-left-radius:  20px;
浏览器支持性
Firefox(2、3+)
Google Chrome(1.0.154+…)
Google Chrome(2.0.156+…)
Safari(3.2.1+ windows)
Internet Explorer(IE7, IE8)
Opera 9.6