html - 堆叠一些图像

Question

在我的代码中，我试图能够像这样堆叠图像

其中有 2 张图片在后面，一张在上面。

我试过使用 float 和 z-index

Question how can I get it so my images are like in the above example?

正在工作 DEMO <-- 更新了工作解决方案

<div class="container">
<div class="row">

<div class="col-lg-12">
<img data-src="holder.js/50px320?theme=social" class="img-thumbnail img-1">
<img data-src="holder.js/50px320?theme=lava" class="img-thumbnail img-2">
<img data-src="holder.js/50px320?theme=grey" class="img-thumbnail img-3">
</div>

</div>
</div>

CSS

.img-1 {
   z-index: 2;
   float: none;
   clear: both;
}

.img-2 {
   float: left; 
   z-index: 1;
}

.img-3 {
   float: right; 
   z-index: 1;
}

Answer 1

这是另一种解决方案:

.img-1 {
  display: block;
  position: absolute;
  left: 0;
  top: 30px;
   z-index: -1;
}

.img-2 {
  display: block;
  position: absolute;
  top: 30px;
  right: 0;
  z-index: -1;
}

.img-3 {
  display: block;
  position: relative;
  z-index: 1;
  margin: 0 auto;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/holder/2.9.4/holder.min.js"></script>
<div class="container">
  <div class="row">
    <div class="col-lg-12">
      <img data-src="holder.js/50px320?theme=social" class="img-thumbnail img-1">
      <img data-src="holder.js/50px320?theme=lava" class="img-thumbnail img-2">
      <img data-src="holder.js/50px320?theme=grey" class="img-thumbnail img-3">
    </div>
  </div>
</div>