JSFiddle - React, Tailwind, and code Playground

HTML

<div id="scroll"> 
   <div class="items"> 
    
     <div> 
         <span class="scroll_img">jedna</span> 
         <span class="scroll_img">dva</span> 
         <span class="scroll_img">tri</span> 
     </div> 
      
     <div> 
          <span class="scroll_img">styri</span> 
          <span class="scroll_img">pat</span> 
          <span class="scroll_img">sest</span> 
     </div> 
      
   </div> 
 </div>

JavaScript

$("#scroll .items .scroll_img").click(function(){ 
    alert($("#scroll .items .scroll_img").index(this)); 
 });