ul, ol {
    list-style: none
}

li {
    vertical-align: middle
}

.nav {
    width: 100%;
    min-width: 1200px;
    height: 50px;
    line-height: 50px;
    position: relative;
    /*margin-top: 10px;*/
}

    .nav > ul { /*.nav下一级的ul，并非子级中的ul*/
        width: 1200px;
        height: 100%;
        margin: 0 auto;
        padding: 0;
        list-style: none;
        font-size: 18px;
    }

        .nav > ul > li {
            width: 140px;
            margin-left:3px;
            margin-right:3px;
            text-align:center;
            height: 50px;
            line-height:50px;
            float: left;
            padding: 0px 10px;
        }

            .nav .selected, .nav > ul > li:hover/*, .nav > ul > li > .current*/ {
                border-bottom: 3px solid #fff;
            }

            .nav > ul > li span { /*第1级菜单，写在span内，非选中菜单㳀灰色*/
                display: inline-block;
                width: auto;
                padding-left: 20px;
                padding-right: 20px;
                height: 100%;
                padding: 0px 15px;
                color: #eaeaea;
                font-size: 16px;
                position: relative;
            }
            .nav > ul > li > span:hover { /*鼠标扫过第1级菜单，文字白色*/
                color: #fff;
            }
            .nav > ul > li.selected > span { /*选中样式的菜单，文字白色*/
                color: #fff;
            }

        .nav > ul li span.trangle {
            background: url(/Img/menu/trangle.png) no-repeat 84px 23px;
        }

        .nav > ul li span.trangle.change-icon {
            background: url(/Img/menu/trangle-up.png) no-repeat 84px 23px;
        }

div.userChildren {
    width: 100%;
    position: absolute;
    top: 50px;
    left: 0px;
    z-index: 999;
    background: rgba(65, 120, 190, 0.9);
    padding: 10px 0 30px 0;
    box-shadow: 0px 10px 20px rgba(4, 0, 0, .1);
    overflow: hidden;
    margin-top: 0px;
    margin-bottom: 0px;
    display: none;
}

    div.userChildren > ul {
        width:1200px;
        margin:0px auto;
    }

    div.userChildren ul li {
        width: 21.5%;
        /* height: 50px; */
        float: left;
        margin-top:10px;    /*行间距*/
        margin-right: 25px;
        position: relative;
    }

        div.userChildren ul li a {
            display: inline-block;
            width: 100%;
            /*line-height: 25px;*/
            text-decoration: none;
            margin-bottom: 3px;
            border: 1px solid rgba(255, 255, 255, .8);
            font-size: 15px;
            color: #fff;
            position: relative;
        }

    div.userChildren ul.addText li .arrow-left { /*左下角：左边↑*/
        width: 1px;
        height: 0px;
        background: #004fa0;
        position: absolute;
        left: 25px; /*ul宽度1200px，li宽度100%，a宽度80%*/
        bottom: 0px;
        z-index: 9999;
        cursor: pointer;
        overflow: hidden;
    }

    div.userChildren ul.addText li .arrow-bottom { /*左下角：下边→*/
        width: 0px;
        height: 1px;
        background: #004fa0;
        position: absolute;
        left: 26px;
        bottom: 0px;
        z-index: 9999;
        cursor: pointer;
        overflow: hidden;
    }

    div.userChildren ul.addText li .arrow-right { /*右上角：右边↓*/
        width: 1px;
        height: 0px;
        background: #004fa0;
        position: absolute;
        right: 26px;
        top: 0px; /*右边框往下1px，高度刚好封右下角*/
        z-index: 9999;
        cursor: pointer;
        overflow: hidden;
    }

    div.userChildren ul.addText li .arrow-top { /*右上角：上边←*/
        width: 0px;
        height: 1px;
        background: #004fa0;
        position: absolute;
        right: 26px;
        top: 0px;
        z-index: 9999;
        cursor: pointer;
        overflow: hidden;
    }