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      4.     .nav ul.level1 {
        z-index: 9999
    }
    
    .nav ul.level1 li {
        position: relative;
        z-index: 9999
    }
    
    .nav ul.level1 li a {}
    
    .nav ul.level2 {
        position: absolute;
        background: #00549a;
        top: 80px;
        left: 0px;
        display: none;
        width: 100%;
        z-index: 9999
    }
    
    .nav ul.level2 li {
        padding: 0;
        margin: 0;
        background: #00549a;
        border-bottom: 1px solid #00457e;
        margin-right: 0;
        line-height: 30px;
        height: 30px;
        display: block;
        float: left;
        width: 100%;
        text-align: center;
        font-size: 14px;
    }
    
    .nav ul.level2 li a {
        width: 98px;
        height: 30px;
        line-height: 28px;
        padding: 0;
        color: #fff;
        display: block;
        font-size: 12px;
        font-family: "宋體";
    }
    
    .nav ul.level2 li.active a {
        background: #82c31f;
        color: #fff;
    }

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