JSFiddle - React, Tailwind, and code Playground

HTML

<img src="http://www.nasa.gov/images/content/711375main_grail20121205_4x3_946-710.jpg" />
<img src="http://www.nasa.gov/images/content/711375main_grail20121205_4x3_946-710.jpg" />
<img src="http://www.nasa.gov/images/content/711375main_grail20121205_4x3_946-710.jpg" />
<img src="http://www.nasa.gov/images/content/711375main_grail20121205_4x3_946-710.jpg" />

CSS

img{width:100px;z-index:2;border:2px solid #333;}

img+img{margin-left:-40px;}

img:hover{border:2px solid #0f0;}