IE7 z-index bug in HTML/CSS

Encountering two issues, one major and one minor.

The dropdown menu functions flawlessly across browsers except for IE7. In IE7, the z-index value of the dropdown's containing ul is disregarded, causing it to appear behind the content:

The second issue arises when initially hovering over a menu item and the ul appears with a small width before expanding suddenly. (This occurs only in IE7)

To witness the problem firsthand, visit the following page: http://rcnhca.org/site/first_steps/

Here are the relevant HTML markup (note the utilization of the 960 grid system):


    <div id="header">
        ....
    </div>

And the corresponding CSS style


    /* =============================================================================
       Header
       ========================================================================== */
       
    #header {
        ...
    }
    
    ...

Any insights on how to ensure that the menu items occupy 100% of the ul's width without explicitly setting a width?

Appreciate your assistance.

Answer №1

The z-index property will only take effect when used with the position values relative, absolute, or fixed. Here's an example:

#header {
    position: relative;
    z-index: 5;
}

Answer №2

To resolve the issue with IE7, it is recommended to remove position:relative from #supplements, #logobar, and #logo while keeping the .grid_16 class intact.

Consider reducing the number of styles applied as excessive styling may lead to complications. Simplifying the design by minimizing default positioning, display settings, floats, and inheritance can help avoid potential errors in the layout.

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