CSS object shows under other objects when zoom

Tags: html,css

Problem :

CSS object shows under other objects when zoom, I want to make this above all css or html objects. Can someone help me? Thank you in advance.

How is it zoomed: http://i.stack.imgur.com/oNAzz.jpg

How I want to be zoomed: http://i.stack.imgur.com/VcPWy.jpg


    <br><center><li><a href="#"><img src="1.png" onmouseover="this.src='2.png'" onmouseout="this.src='1.png'" /></a></li></center>
    <center><li><div id="mmenu"><a href="#"><img src="1contact.png" onmouseover="this.src='2contact.png'" onmouseout="this.src='1contact.png'" /></a></div></li></center>
    <center><li><div id="mmenu"><a href="http://soccerway.ge/?cat=1"><img src="1news.png" onmouseover="this.src='2news.png'" onmouseout="this.src='1news.png'" /></a></div></li></center>


nav {
    position: fixed;
  left: 0px;
  top: 20%;
  height: 200px;
  width: 60px;
  background-color: #24933e;
  border-right:solid #176328;

#mmenu {
  border-bottom:solid #176328;

Solution :

Use the Z-index Property and assign to nav a higher z- index than others

 nav {
  position: fixed;
  left: 0px;
  top: 20%;
  height: 200px;
  width: 60px;
  background-color: #24933e;
  border-right:solid #176328;

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