window.addEventListener works only after a refresh – Blancer.com Tutorials and projects

I need a little help for one function which is working only after a refresh. I`m not experienced with javascript and i need just to add one small “div” to already compliled project.

The index.html is

... 
<body>
<script src="runtime-es2015-container.js" type="module">
<script src="runtime-es5-container.js" nomodule defer>
<script src="polyfils-es-5.js" defer>

<script>
 window.addEventListener("DOMContentLoaded", function() {
 setTimeout(() => {
   let envContainer = document.querySelector('.info');
   envContainer.setAttribute('style', 'flex-direction:column);
   let envRow = document.createElement('div');
   envRow.classList.add('instance');
   envContainer.appendChild(envRow).innerText = 'some text ';
   },100);
 }
 ....

The functional is working only after refreshing the page. I gues the problem is with selecting the ‘.info’ , which is loaded before the function is executed.

Thanks,
Svetoslav