Z索引定位無法正常工作

Question

我有一個容器，我想使h2看起來與中心對齊，后面有一條細線。 我不能做的就是使線在h2框后面。 不管我怎么努力，它不斷跨越的氫氣箱。

這里是我需要完成的示例：

任何幫助表示贊賞。

<div class="wrapper">
  <div class="section-header">
    <h2>H2 needs to be centered</h2>
    <div class="line-section-header"></div>
  </div>
</div>

我正在使用的CSS是：

h2 {
    font-family: 'Open Sans', Arial, sans-serif;
    font-family: 20px;
    font-weight: 700;
    text-transform: uppercase;
    width: 140px;
    color: #3F3F3F;
    background-color: white;
    padding: 5px 10px;
    border: 1px solid #D3D3D3;
    text-align: center;
    margin: 0 auto;
    z-index: 999;
}


.wrapper {
    margin: 0 auto;
    width: 980px;
    height: 1000px;
    background-color: #white;
}

.section-header {
    width: 100%;
    height: auto;
    background-color: white;
    float: left;
    position: relative;
}

.line-section-header {
    width: 100%;
    height: 1px;
    background-color: #D3D3D3;
    margin-top: 15px;
    position: absolute;
}

Answer 1

我做了一個樣本。 檢查我的jsfiddle http://jsfiddle.net/amitv1093/r3arp2m8/

HTML

<div class="container">

  <h2>  h2 </h2>
  <div class="line"> </div>

</div>

CSS

.container
{
  position:relative;
text-align:center;
 background:#d9d9d9;
  z-index:-99;
  padding:12px 0px;
}

h2
{
width:100px;  
background:grey;
height:50px;
text-align:center;
  margin:0px auto;
  line-height:50px;

}

.line
{
  position:absolute;
  width:100%;
  height: 1px;
  background: red;
  top:50%;
  margin:1px 0px;  
  z-index:-9;

}

Answer 2

h2 {//其他道具位置：相對； }

Answer 3

對齊將隨着容器高度動態變化

 .wrapper { margin: 0 auto; width: 980px; height: 1000px; background-color: #white; } .section-header { width: 100%; height: auto; background-color: white; float: left; position: relative; } h2 { font-family: 'Open Sans', Arial, sans-serif; font-family: 20px; font-weight: 700; text-transform: uppercase; width: 140px; color: #3F3F3F; background-color: white; padding: 5px 10px; border: 1px solid #D3D3D3; text-align: center; margin: 0 auto; z-index: 999; position: relative; } .line-section-header { width: 100%; height: 1px; background-color: #D3D3D3; top: 50%; position: absolute; z-index: 1; } 

 <div class="wrapper"> <div class="section-header"> <h2>H2 needs to be centered</h2> <div class="line-section-header"></div> </div> </div> 

Answer 4

嘗試添加以下內容：

h2 {
  position: absolute;
  left:0;
  right:0;
  margin:auto;
}

.line-section-header {
  margin-top: 50px;
  position: absolute;
}

Answer 5

嘗試在CSS中更改此設置：

h2 {
    font-family: 'Open Sans', Arial, sans-serif;
    font-family: 20px;
    font-weight: 700;
    text-transform: uppercase;
    width: 140px;
    color: #3F3F3F;
    background-color: white;
    padding: 5px 10px;
    border: 1px solid #D3D3D3;
    text-align: center;
    margin: 0 auto;
    margin-left: 420px;
    z-index: 2;
    position: absolute;
}


.wrapper {
    margin: 0 auto;
    width: 980px;
    height: 1000px;
    background-color: #white;
    position: relative;
}

.section-header {
    width: 100%;
    height: auto;
    background-color: white;
    float: left;
    position: relative;
}

.line-section-header {
    width: 100%;
    height: 1px;
    background-color: #D3D3D3;
    margin-top: 70px;
    position: absolute;
    z-index: 1;
}