JSFiddle - React, Tailwind, and code Playground

HTML

<div class="window">
		
	
  </div>

CSS

.window{
    padding:10px;
    height:100px;
    background:tomato;
}
.lamel{
    width:100px;
    height:100px;
    background:lightgreen;
    float:left;
    margin:0 0 0 10px;
}

JavaScript

!function multiply(){
  
 var s=3;
 for(i=0;i<s;i++){
      var newDiv = document.createElement('div');
      newDiv.className = 'lamel' ;
      document.getElementsByClassName('window')[0].appendChild(newDiv);
 }
  
}();