css实现自适应下拉菜单效果-html代码-BFW代码库

css实现自适应下拉菜单效果

代码语言：html

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
    <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <link type="text/css" rel="stylesheet" href="http://repo.bfw.wiki/bfwrepo/css/reset.min.css">
    <style type="text/css" media="all">
        .index-nav {
            width: 100%;
            border-bottom: 1px solid #eeeeee;
            height: 50px;
            box-sizing: border-box;
            background: white;
        }
        .index-nav-frame {
            width: 1200px;
            margin: 0 auto;
        }
        .index-nav-frame-line {
            color: #333333;
            background: white;
            float: left;
            position: relative;
            display: block;
            outline: none;
            cursor: pointer;
            width: 100px;
            line-height: 50px;
            text-align: center;
            font-weight: 700;
        }
        .index-nav-frame-line.active {
            color: #b63b4d;
        }

        .index-nav-frame-line-center {
            opacity: 0;
            height: 0;
            position: absolute;
            overflow: hidden;
            width: 100%;
            transition: all 0.5s;
            -webkit-transition: all 0.5s;
            -moz-transition: all 0.5s;
            /* Firefox 4 */-o-transition: all 0.5s;
            /* Opera */
        }
        .index-nav-frame-line-li {
            width: 100%;
            font-weight: 500;
            text-align: center;
            background: white;
            color: #666666;
        }
        .index-nav-frame-line-li:hover {
            background: #444359;
            color: white;
        }
        .index-nav-frame-line-li:hover a {
            background: #444359;
            color: white;
        }
        .index-nav-frame-line-focus:focus {
            display: none;
        }
        .index-nav-frame-line:hover .index-nav-frame-line-center {
            height: auto;
            opacity: 1;
        }

        .nav-line {
            height: 50px;
            width: 100%;
            position: relative;
            display: none;
            outline: none;
        }
        .nav-small {
            width: 30px;
            height: 30px;
            position: absolute;
            right: 10px;
            top: 10px;
            cursor: pointer;
            display: none;
            outline: none;
        }
        .nav-small img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .nav-small-focus {
            position: absolute;
            width: 100%;
            height: 100%;
            display: none;
        }
        .nav-small-focus:focus {
            display: none;
        }
@media only screen and (max-width:800px) {
            .index-nav-frame-line-li a {
                display: block;
                color: white;
            }
            .nav-line {
                display: block;
                border-bottom: 1px solid #eeeeee;
            }
            .nav-small {
                display: block;
            }
            .nav-small:focus~.index-nav-frame-line {
                height: auto;
                border-bottom: 1px solid #ccc;
            }
            .nav-small:focus .nav-small-focus {
                display: block;
            }
            .index-nav-frame {
                width: 100%;
            }
            .index-nav-frame-line {
                width: 100%;
                height: 0;
                overflow: hidden;
            }
            .index-nav-frame-line-center {
                position: relative;
                background: #444359;
            }
            .index-nav-frame-line:hover .index-nav-frame-line-center {
                height: 0;
                opacity: 0;
            }
            .index-nav-frame-line-li {
                border-bottom: 1px solid #4b4a5e;
                color: #d9d9d9;
                background: #444359;
            }
            .index-nav-frame-line-li:hover {
                background: #b63b4d;
            }
            .index-nav-frame-line:focus {
                height: auto;
                border-bottom: 1px solid #ccc;
            }
            .index-nav-frame-line:focus>.index-nav-frame-line-center {
                height: auto;
                opacity: 1;
            }
            .index-nav-frame-line:focus .index-nav-frame-line-header {
                color: #B63B4D;
            }
            .index-nav-frame-line-focus {
                display: none;
                width: 100%;
                height: 50px;
                position: absolute;
                left: 0;
                top: 0;
            }
            .index-nav-frame-line:focus .index-nav-frame-line-focus {
                display: block;
            }

        }
    </style>
</head>
<bo.........完整代码请登录后点击上方下载按钮下载查看