html - CSS z-index 在相对 div 内的绝对 div 中不起作用

Question

z-index 不工作。我有一个进程 div(容器)而在process div里面，是一排排的链接。同样，链接分为 progress_number div(large number)和 progress_text div(大数字下方的简短描述)。我在每个 progress_number div 之间放置了横条。

这是html代码

<div class="process">
    <a href="">
        <div class="process_number">1</div>
        <div class="process_text">text1</div>
    </a>
    <a href="">
        <div class="process_number">2</div>
        <div class="process_text">text2</div>
    </a>
    <a href="" class="process_selected">
        <div class="process_number">3</div>
        <div class="process_text">text3</div>
    </a>
    <a href="">
        <div class="process_number">4</div>
        <div class="process_text">text4</div>
    </a>
    <a href="">
        <div class="process_number">5</div>
        <div class="process_text">text5</div>
    </a>
</div>

这是CSS代码。

.process{
    width:100%;
    height:160px;
    border-bottom:1px solid #c4cdd2;
    margin-top:35px;
    z-index:;
}
.process a{
    text-align:center;
    text-decoration:none;
    display:inline-block;
    margin-left:186.5px;
    position: relative;
}
.process a:first-child{
    margin-left:50px;
}   
.process .process_number{
    height:75px;
    width:75px;
    font-size:47px;
    font-weight:bold;
    border: 1px solid #47a5d8;
    border-radius:100%;
    color: #47a5d8;
    background-color:#fff;
    text-align:center;
    line-height:170%;
    z-index:;
}   
.process .process_text{
    font-size:15px;
    font-weight:bold;
    color: #c4cdd2;
    margin-top:10px;
}
.process .process_number::before{
    content:'';
    position:absolute;
    top:33px;
    right:55px;
    width:250px;
    height:10px;
    background-color:#47a5d8;
    z-index:1;
}
.process a:first-child .process_number::before{
    display:none;
}
.process_selected .process_number{
    color:#fff;
    background-color:#47a5d8;
}
.process_selected ~ a .process_number{
    color:#c4cdd2;
    background-color:#fff;
    border-color:#c4cdd2;
}
.process_selected ~ a .process_number::before{
    background-color:#c4cdd2;
} 
.process_selected .process_text{
    color:#47a5d8;
}

现在我想隐藏大圆有界数(.process_number)后面的条(.process_number::before)。我试过正确修改 z-index，但对任何元素的每次尝试都失败了。请给我一些建议。

Answer 1

我看到将 z-index: -1 设置为 .process .process_number::before 就可以了。

.process{
    width:100%;
    height:160px;
    border-bottom:1px solid #c4cdd2;
    margin-top:35px;
    z-index:;
}
.process a{
    text-align:center;
    text-decoration:none;
    display:inline-block;
    margin-left:186.5px;
    position: relative;
}
.process a:first-child{
    margin-left:50px;
}   
.process .process_number{
    height:75px;
    width:75px;
    font-size:47px;
    font-weight:bold;
    border: 1px solid #47a5d8;
    border-radius:100%;
    color: #47a5d8;
    background-color:#fff;
    text-align:center;
    line-height:170%;
    z-index:;
}   
.process .process_text{
    font-size:15px;
    font-weight:bold;
    color: #c4cdd2;
    margin-top:10px;
}
.process .process_number::before{
    content:'';
    position:absolute;
    top:33px;
    right:55px;
    width:250px;
    height:10px;
    background-color:#47a5d8;
    z-index:-1;
}
.process a:first-child .process_number::before{
    display:none;
}
.process_selected .process_number{
    color:#fff;
    background-color:#47a5d8;
}
.process_selected ~ a .process_number{
    color:#c4cdd2;
    background-color:#fff;
    border-color:#c4cdd2;
}
.process_selected ~ a .process_number::before{
    background-color:#c4cdd2;
} 
.process_selected .process_text{
    color:#47a5d8;
}

<div class="process">
    <a href="">
        <div class="process_number">1</div>
        <div class="process_text">text1</div>
    </a>
    <a href="">
        <div class="process_number">2</div>
        <div class="process_text">text2</div>
    </a>
    <a href="" class="process_selected">
        <div class="process_number">3</div>
        <div class="process_text">text3</div>
    </a>
    <a href="">
        <div class="process_number">4</div>
        <div class="process_text">text4</div>
    </a>
    <a href="">
        <div class="process_number">5</div>
        <div class="process_text">text5</div>
    </a>
</div>