JSFiddle - React, Tailwind, and code Playground

HTML

<div class="firstHeader">
    nějaký zběssilý text
</div>

CSS

.firstHeader {
   
    
    height: 60%; /*třeba*/
    width: 100%; /*třeba*/
    background-image: url('http://tmacfitness.com/wp-content/uploads/2013/04/Beauty-of-nature-random-4884759-1280-800.jpg');
    background-position: center center;
    background-size: cover;
    
  
    
}