纯css实现顶部、底部的固定菜单源码

2021-01-30 网页编程网 网页编程网

1.顶部固定菜单

<html>
<head>
    <style>
        #top-menu {
            position: fixed;
            z-index: 10;
            left: 0;
            right: 0;
            top: 0;
            background-color:rgba(255,255,0,0.5); /*透明效果*/
        }

#top-menu li {
            float: left;
            list-style: none;
        }

#top-menu a {
            display: block;
            padding: 5px 25px 7px 25px;
            width: 4em;
            text-align: center;
            -webkit-transition: .5s all ease-out;
            -moz-transition: .5s all ease-out;
            transition: .5s all ease-out;
            border-top: 3px solid white;
            color: #aaa;
            text-decoration: none;
        }

#top-menu a:hover {
            color: #000;
        }

#top-menu li.active a {
            border-top: 3px solid #333;
            color: red;
        }

#foo {
            position: absolute;
            top: 400px;
        }

#bar {
            position: absolute;
            top: 800px;
        }

#baz {
            position: absolute;
            top: 1200px;
        }
    </style>
</head>
<body>

2.底部固定菜单

ul默认是有margin的，如果#top-menu不定义margin:0;会有空隙。

<html>
<head>
    <style>
        #top-menu {
            position: fixed;
            z-index: 10;
            left: 0;
            right: 0;
            bottom: 0;
            width: 100%;
            background-color:rgba(255,255,0,0.5); 
            margin:0; /*很重要*/
        }
        
        #top-menu li {
            float: left;
            list-style: none;
            
        }

#top-menu a {
            display: block;
            padding: 10px 25px 5px 25px;
            width: 4em;
            text-align: center;
            -webkit-transition: .5s all ease-out;
            -moz-transition: .5s all ease-out;
            transition: .5s all ease-out;
            border-bottom: 3px solid cyan;
            color: #aaa;
            text-decoration: none;
        }

#top-menu a:hover {
            color: #000;
        }

#top-menu li.active a {
            border-bottom: 3px solid #333;
            color: red;
        }

#foo {
            margin-top: 400px;
        }

#bar {
            margin-top: 400px;
        }

#baz {
            margin-top: 400px;
        }
    </style>
</head>
<body>

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