title: Issue with putting div over another div
body: <p>Before giving negative vote or placing the question as duplicate, please read the issue first.</p>
  
  <p>I'm having some issue with putting one div under another. I know that make people have asked this question here and I've read all of them and also tried everything out, but none of them worked for me.</p>
  
  <p>Everyone days to give <code>position: relative</code> to to div and then give one higher <code>z-index</code> and another lower. None of them worked for me. So, I'm here for help.</p>
  
  <p>In my project (<a href="http://loadtest.isaumya.com/" rel="nofollow">http://loadtest.isaumya.com/</a>) I have 2 divs i.e.</p>
  
  <pre><code>&lt;body&gt;
  &lt;div class="conteiner"&gt;blah blah blah&lt;/div&gt;
  
  &lt;div id="particle-js"&gt;&lt;/div&gt;
  &lt;/body&gt;
  </code></pre>
  
  <p>I want to put the <code>&lt;div id="particle-js"&gt;&lt;/div&gt;</code> behind of container, but nothing is working out. So please help.</p>