css3实例教程 一款纯css3实现的环形导航菜单

            height: 100px;
            display: block;
            border-radius: 50%;
            position: absolute;
            top: 225px;
            left: 225px;
            background: #ecf0f1;
            -webkit-transition: all 0.4s ease;
            transition: all 0.4s ease;
        }
       
        .link_one
        {
            background: url("home.png") #f1c40f no-repeat center center;
        }
       
        .link_two
        {
            background: url("mail.png") #f1c40f no-repeat center center;
        }
       
        .link_three
        {
            background: url("set.png") #f1c40f no-repeat center center;
        }
       
        .link_four
        {
            background: url("start.png") #f1c40f no-repeat center center;
        }　　[code]