在线预览 源码下载

实现的代码。

html代码：

  
        
            
                
                    Incoming Messages
            
            
                
                    
                        News                        32 
                    
                    Priority 8                     
                    
                    Assigned 0/17                     
                    
                    Archived 3                     
                    
                    Deleted 9                     
                    
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                    32 
                    
                    8 
                    
                    0/17 
                    
                    3 
                    
                    9 
                    
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css代码：

    body        {            background: #F4F4F4;            font-family: Arial, sans-serif;            font-size: 14px;            font-weight: lighter;        }                .l-main        {            width: 530px;            margin: 0 auto;        }                .menu        {            width: 250px;            margin: 40px;            background: #fff;            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);            border-radius: 5px;            float: left;        }                .menu__header        {            background: #4B4F55;            border-bottom: 1px solid #353A40;            border-radius: 5px 5px 0 0;        }                .menu__header-title        {            color: #fff;            padding: 15px;            text-shadow: 0 1px 0 rgba(0, 0, 0, 0.4);        }                .menu__body        {            border-radius: 0 0 5px 5px;        }                .menu--small        {            width: 110px;        }                .nav        {            list-style: none;        }                .nav__item        {            position: relative;        }                .nav__item-link        {            padding: 10px 15px;            text-decoration: none;            color: #8B8E93;            display: block;            border-bottom: 1px solid #F0F0F0;        }        .nav__item-link:hover        {            background: #f0f0f0;        }        .nav__item-link.is-active        {            background: #6E757F;            color: #fff;            border-bottom-color: #4B4F55;            box-shadow: 0 1px 0 #7A828D inset;        }        .nav__item-link.is-active:after        {            content: '';            display: block;            position: absolute;            top: 50%;            right: -6px;            margin-top: -6px;            border-top: 6px solid transparent;            border-bottom: 6px solid transparent;            border-left: 6px solid #6E757F;        }        .nav__item-link.is-active .nav__item-icon        {            color: #fff;        }        .nav__item:last-child .nav__item-link        {            border-bottom: none;        }                .nav__item-icon        {            color: #D2D5DA;            width: 20px;            text-align: center;            font-size: 18px;            margin-right: 10px;        }                .badge        {            font-size: 12px;            padding: 2px 8px;            border: 1px solid #D1D1D1;            border-radius: 10px;            position: absolute;            top: 10px;            right: 15px;        }                .badge--warning        {            background: #ED373F;            border-color: #ED373F;        }