css3实例教程 一款纯css3实现的环形导航菜单

　　之前为大家介绍了好几款导航菜单，今天要给大家带来一款纯css3实现的环形导航菜单。该导航比较新鲜，列表图标位于中间，单击列表图标的时候，各项分布于列表图表的四周。形成一个环形。效果图如下：

　　实现的代码。

　　html代码：

　　css代码：

[code]body
        {
            background: #34495e;
        }
       
        .container
        {
            width: 550px;
            display: block;
            margin: auto;
            position: relative;
        }
       
        h1
        {
            text-align: center;
            font-family: 'Roboto' , sans-serif;
            font-weight: 400;
            color: #f1c40f;
        }
       
        .menu_opener
        {
            display: none;
        }
       
        .menu_opener:checked ~ .link_one
        {
            top: 65px;
        }
        .menu_opener:checked ~ .link_two
        {
            left: 385px;
        }
        .menu_opener:checked ~ .link_three
        {
            top: 385px;
        }
        .menu_opener:checked ~ .link_four
        {
            left: 65px;
        }
        .menu_opener:checked ~ .barre_hamburger
        {
            opacity: 0;
        }
        .menu_opener:checked ~ .menu_opener_label:after
        {
            transform: rotate(45deg);
            top: 70px;
        }
        .menu_opener:checked ~ .menu_opener_label:before
        {
            transform: rotate(-45deg);
            top: 70px;
        }
       
        .menu_opener_label
        {
            background: #f1c40f;
            width: 150px;
            height: 150px;
            display: block;
            cursor: pointer;
            border-radius: 50%;
            position: absolute;
            top: 200px;
            left: 200px;
            z-index: 10;
        }
        .menu_opener_label:after
        {
            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;
    &nbs