css3实例教程 一款纯css3实现的环形导航菜单

            position: absolute;
            top: 50px;
            left: 50px;
            background: #000;
            content: "";
            width: 50px;
            height: 10px;
            -webkit-transition: all 0.4s ease;
            transition: all 0.4s ease;
        }
        .menu_opener_label:before
        {
            position: absolute;
            top: 90px;
            left: 50px;
            background: #000;
            content: "";
            width: 50px;
            height: 10px;
            -webkit-transition: all 0.4s ease;
            transition: all 0.4s ease;
        }
       
        .barre_hamburger
        {
            width: 50px;
            height: 10px;
            position: absolute;
            top: 270px;
            left: 250px;
            background: #000;
            z-index: 20;
            -webkit-transition: all 0.4s ease;
            transition: all 0.4s ease;
        }
       
        .link_general
        {
            width: 100px;