html - 如何向绝对定位元素添加叠加层？

Question

尝试将覆盖添加到绝对定位的图像。下面的代码可以正常工作，但并不完美。

已经尝试过使用 z-index 属性，但没有成功。

下面是代码在 Codepen 上的工作示例。

http://codepen.io/anon/pen/pRdmaX

HTML

<div class="test">
  <img src="http://lorempixel.com/output/food-q-c-80-80-6.jpg" alt="image" class="img-responsive">
  <i class="fa fa-plus"></i>
  <h2>Lorem Ipsum</h2>                                  
  <p>text</p>
</div>

CSS

.test {
    position: relative;
    padding-left: 97px;
    margin-bottom: 42px;
    padding-top: 18px;
}
.test img {
    position: absolute;
    left: 0;
    top: 6%;
    border: 3px solid #FFF;
    max-width: 80px;
    cursor: pointer;
}
.test img:hover + i {
    opacity: .7;
    top: 7px;
}
.test i {
    background: #ccc none repeat scroll 0 0;
    color: #ffffff;
    font-size: 20px;
    top: -50%;
    left: 3px;
    line-height: 68px;
    position: absolute;
    text-align: center;
    width: 74px;
    height: 74px;
    transition: .3s;
    opacity: 0;
}
.test h2 {
  margin-top: 0;
  margin-bottom: 0;
}

Answer 1

只需将 pointer-events: none 添加到您的 .test i 规则，它就会正常运行(悬停时不会闪烁)

要使其匹配 img 的位置/大小，请使用相同的位置/大小值

.test {
    position: relative;
    padding-left: 97px;
    margin-bottom: 42px;
    padding-top: 18px;
}
.test img {
    position: absolute;
    left: 0;
    top: 6%;
    border: 3px solid #FFF;
    width: 80px;
    cursor: pointer;
}
.test img:hover + i {
    opacity: .7;
    top: 6%;
}
.test i {
    background: #ccc none repeat scroll 0 0;
    color: #ffffff;
    font-size: 20px;
    top: -50%;
    left: 0;
    top: 6%;
    border: 3px solid #FFF;
    width: 80px;
    height: 80px;  
    line-height: 68px;
    position: absolute;
    text-align: center;
    transition: .3s;
    opacity: 0;
    pointer-events: none;
}
.test h2 {
  margin-top: 0;
  margin-bottom: 0;
}

<div class="test">
  <img src="http://lorempixel.com/output/food-q-c-80-80-6.jpg" alt="image" class="img-responsive">
  <i class="fa fa-plus"></i>
  <h2>Lorem Ipsum</h2>                                  
  <p>text</p>
</div>

---

根据评论添加了第二个示例

.test {
    position: relative;
    padding-left: 97px;
    margin-bottom: 42px;
    padding-top: 18px;
}
.test a {
    position: absolute;
    left: 0;
    top: 6%;
    border: 3px solid #FFF;
    width: 80px;
    cursor: pointer;
}
.test a:hover + i {
    opacity: .7;
    top: 6%;
}
.test i {
    background: #ccc none repeat scroll 0 0;
    color: #ffffff;
    font-size: 20px;
    top: -50%;
    left: 0;
    top: 6%;
    border: 3px solid #FFF;
    width: 80px;
    height: 80px;  
    line-height: 68px;
    position: absolute;
    text-align: center;
    transition: .3s;
    opacity: 0;
    pointer-events: none;
}
.test h2 {
  margin-top: 0;
  margin-bottom: 0;
}

<div class="test">
  <a href="#"><img src="http://lorempixel.com/output/food-q-c-80-80-6.jpg" alt="image" class="img-responsive"></a>
  <i class="fa fa-plus"></i>
  <h2>Lorem Ipsum</h2>                                  
  <p>text</p>
</div>