div上还有一个div，如何把下层div中的元素显示出来？

如图所示，我想把下层DIV中的“手机和三角形”显示出来，请问要如何修改？代码如下：

<div class="top">
    <ul>
        <li class="phone">
            <a href="#">手机</a>
            <span class="arrow"></span>
            <div class="t-pop"></div>
        </li>
        <li>
            服务
            <span class="arrow"></span>
        </li>
        <div class="clearfloat"></div>
    </ul>
</div>

<style>
    a {
        text-decoration: none;
    }
    .clearfloat {
        clear: both;
        height: 0;
        font-size: 1px;
        line-height: 0px;
    }
    ul {
        width: 300px;
        margin: 0;
        padding: 0;
        list-style: none;
        background-color: #ACE2AC;
        border-bottom: 1px solid #EEEEEE;
    }
    ul li {
        padding: 0px 50px;
        border-left: 1px solid #eee;
        border-right: 1px solid #eee;
        height: 50px;
        line-height: 50px;
        float: left;
        color: #666;
    }
    ul li a {
        color: #666;
    }
    ul li a:hover {
        color: #E4393C;
        text-decoration: underline;
    }
    ul li.phone {
        position: relative;
    }
    ul li span {
        display: block;
        position: absolute;
        margin-top: -28px;
        margin-left: 40px;
        width: 0;
        height: 0;
        border-width: 5px;
        border-style: solid;
        border-color: #666 transparent transparent transparent;
    }
    ul li div {
        position: absolute;
        width: 98px;
        height: 28px;
        top: 10px;
        left: 15px;
        background-color: #fff;
        border: 1px solid #ddd;
    }
</style>

---

ul li div {
        position: absolute;
        width: 98px;
        height: 28px;
        top: 10px;
        left: 15px;
        background-color: transparent;
        border: 1px solid #ddd;
    }

把div的背景色设成透明的吧。

---

解决了！把a，span标签加上z-index

    ul li a {
        position: relative;
        color: #666;
        z-index: 10;
    }
    ul li span {
        position: relative;
        display: block;
        position: absolute;
        margin-top: -28px;
        margin-left: 40px;
        width: 0;
        height: 0;
        border-width: 5px;
        border-style: solid;
        border-color: #666 transparent transparent transparent;
        z-index: 10;
    }

---

设置div中的z-index属性，值大的div在值小的div上面

---

設置背景透明，設置 pointer-events: none。

ul li div {
    position: absolute;
    width: 98px;
    height: 28px;
    top: 10px;
    left: 15px;
    background-color: transparent;
    border: none;

    pointer-events: none
}