JSFiddle - React, Tailwind, and code Playground

HTML

<div class="block"></div>

CSS

.block {
  background: url(http://estate-in-kharkov.com/objavlenija/sale-houses-plots/obj_15414/park-canal-forest-tree_min.jpg) 50% 50%;
  width: 50px; height: 50px;
  transition: all 0.3s;
}

.block:hover {
  background: url(http://wallpapers1.ru/priroda/data/sm-priroda21_021.jpg) 50% 50%;
}