CSS下拉菜单

一级菜单
picture
二级菜单
picture1
三级菜单
picture2
源码:

<!DOCTYPE>
<html>
    <head>
        <meta charset="utf-8">
        <style type="text/css">
            /*去掉默认的内边距和外边距*/
            .multi_drop_menu * {
                margin: 0;
                padding: 0;
            }
            /*设置菜单的字体*/
            .multi_drop_menu {
                font: 1.5em helvetica, arial, sans-serif;
            }
            /*设置链接的前景色和背景色以及透明边框*/
            .multi_drop_menu a {
                color: #555;
                background-color: #eee;
                padding: .2em 1em;
                border- 3px;
                border-color: transparent;
            }
            /*悬停样式*/
            .multi_drop_menu a:hover {
                color: #fff;
                background-color: #aaa;
            }
            /*激活样式*/
            .multi_drop_menu a:active {
                background-color: #fff;
                color: #ccc;
            }
            /*ul容器浮动*/
            .multi_drop_menu ul {
                float: left;
            }
            .multi_drop_menu li {
                float: left;
                list-style: none;
                position: relative;
            }
            .multi_drop_menu li a {
                display: block;
                border-style: solid;
                background-clip: padding-box;
                text-decoration: none;
            }
            .multi_drop_menu li li {
                float: none;
            }
            .multi_drop_menu li ul {
                 9em;
                display: none;
                position: absolute;
                left: 0;
                top: 100%;
            }
            .multi_drop_menu li:hover > ul {
                display: block;
            }
            .multi_drop_menu li li ul {
                display: none;
            }
            .multi_drop_menu li li:hover > ul {
                display: block;
                position: absolute;
                left: 100%;
                top: 0;
                 9em;
            }
        </style>
    </head>
    <body>
        <nav class="multi_drop_menu">
            <ul>
                <li><a href="">Power</a></li>
                <li><a href="#">Money</a></li>
                <li><a href="#">Love</a></li>
                <li><a href="#">Fame</a>
                    <ul>
                        <li><a href="#">Sport Star</a></li>
                        <li><a href="#">Movie Star</a></li>
                        <li><a href="#">Rock Star</a>
                            <ul>
                                <li><a href="#">Bruce</a></li>
                                <li><a href="#">Bono</a></li>
                                <li><a href="#">Mick Jagger</a></li>
                                <li><a href="#">Bob Dylan</a></li>
                            </ul>
                        </li>
                        <li><a href="#">Web Designer</a></li>
                    </ul>
                </li>
            </ul>
        </nav>
    </body>
</html>

一级菜单

二级菜单

三级菜单

源码:

<!DOCTYPE>
<html>
    <head>
        <meta charset="utf-8">
        <style type="text/css">
            * {
                margin: 0;
                padding: 0;
            }
            .menu ul:first-child li {
                 11em;
                text-align: center;
            }
            .menu a {
                font: 20px "Arial Bloack";
                color: dimgrey;
                text-decoration: none;
                border-color: transparent;
                border- 3px;
                border-style: solid;
                background-clip: padding-box;
                padding: .1em .5em .4em;
                display: block;
            }
            .menu li {
                float: left;
                list-style: none;
                position: relative;
            }
            .menu li a:hover {
                background-color: slategrey;
                color: whitesmoke;
            }
            .menu li li {
                float: none;
            }
            .menu li li ul {
                float: left;
                position: absolute;
                top: 0;
                left: 100%;
                display: none;
            }
            .menu li ul {    
                position: absolute;
                left: 0;
                top: 100%;
                display: none;
            }
            .menu li:hover > ul {
                display: block;
            }
        </style>
    </head>
    <body>
        <nav class="menu">
            <ul>
                <li><a href="">Power</a></li>
                <li><a href="#">Money</a></li>
                <li><a href="#">Love</a></li>
                <li><a href="#">Fame</a>
                    <ul>
                        <li><a href="#">Sport Star</a></li>
                        <li><a href="#">Movie Star</a></li>
                        <li><a href="#">Rock Star</a>
                            <ul>
                                <li><a href="#">Bruce</a></li>
                                <li><a href="#">Bono</a></li>
                                <li><a href="#">Mick Jagger</a></li>
                                <li><a href="#">Bob Dylan</a></li>
                            </ul>
                        </li>
                        <li><a href="#">Web Designer</a></li>
                    </ul>
                </li>
            </ul>
        </nav>
    </body>
</html>
原文地址:https://www.cnblogs.com/1328497946TS/p/12920675.html