JSFiddle - React, Tailwind, and code Playground

HTML

<div class="header">
<img alt="" src="http://1.bp.blogspot.com/-wh4TxxNaNgY/TbAPnVipGII/AAAAAAAABg4/V1vXrtvFQY8/s1600/Ice+1.jpg">
    
   <img alt="" src="http://www.photographyblogger.net/wp-content/uploads/2010/05/flower23.jpg">
</div>

CSS

.header{
    background-color:red;
    position:relative;  height:auto
}

img:first-child{
    position:absolute; top:0; left:0;
    z-index:-1; width:200px
}
img{
    position:absolute; top:0; left:0;
    z-index:10; width:200px
}