Z-index or overflow issue, on a css menu, with gra

Question

Another problem with IE when trying to display a css:hover menu with <ul> and <li> while using a gradient background on the container of the menu.

The hover li is truncated while using a gradient bg and displays correctly without the gradient bg.

It works fine with Chrome and FF...

Demo with gradient

Demo without gradient

Source with gradient (without you just have to delete the .bg class)

HTML

<div class="header bg">
<div id="menu">
    <ul>
       <li><a href="#">Menu</a>
            <ul>
               <li><a href="#">Sub-menu 1</a></li>
               <li><a href="#">Sub-menu 2</a></li>
               <li><a href="#">Sub-menu 3</a></li>
               <li><a href="#">Sub-menu 4</a></li>                
               <li><a href="#">Sub-menu 5</a></li>
            </ul>
        </li>
    </ul>
</div>
</div>

CSS

.header {position:fixed;top:0px;right:0px;left:0px;z-index:10;height:110px;}
.bg {background-image: -moz-linear-gradient(top, #CCCCCC, #888888);
    background-image: -webkit-gradient(linear, left top, left bottom, from(#CCCCCC), to(#888888));
    filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#CCCCCC,endColorstr=#888888);
    -ms-filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#CCCCCC,endColorstr=#888888);    
}

#menu {width:960px;z-index:20;position:relative;height:40px;}
#menu ul {
 margin:0;
 padding:0;
 list-style-type:none;
 text-align:center;
 }
#menu li {
background:#009966;
 float:left;
 padding:0;
 margin-right:1px;
}
#menu li a {
font-size:16px;display:block;width:191px;line-height:40px;color:#FFF;text-decoration:none;
 }
#menu li:hover{background:#FF6600;}
#menu ul li ul {display:none;}
#menu ul li:hover ul {display:block;}
#menu li:hover ul li {float:none;margin:0;padding-bottom:0px;}
#menu li ul li a  {text-align:left;text-indent:10px;font-size:12px;background:none;color:#000;}
#menu li ul li a:hover {}

Anyone could help me on how to make it work with IE please ?

Answer 1

No one found the solution ? ;-)

The issue was made by using the z-index property.

It's crazy, but IE doesn't like it in this case, I don't know why, if anyone could find a good reason, let me know...

Demo with gradient and without the z-index.

The line changed

.header {position:fixed;width:100%;left:0px;height:110px;}