Non-overlapping elements with different z-index values

I have a unique navigation setup where there is a striking red box protruding. The challenge I am facing is making sure this red box overlaps all the Divs below it. I initially tried setting a margin for spacing, but found that it was affecting the layout of child elements within other sections as well. To address this, I attempted using negative margins on the children of the section below to create overlap, but my goal is to have the red box appear on top. Despite utilizing z-index, I have not been able to achieve the desired effect.

If you'd like to explore the example further, please check out my Jsfiddle here: http://jsfiddle.net/1qsuvhnd/29/

HTML

<nav>
    <div id="ribbon"></div>    
</nav>
<div id="context">
    <div class="link"></div>
</div>

CSS

#context {
    width: auto;
    padding: 20px;
    height: 300px;
    background-color: blue;
    z-index: 1;
}
#context .link {
    float: Left;
    height: 260px;
    width: 300px;
    margin-left: -140px;
    background-color: White;
    z-index:1 !important;
}
nav {
    width: auto;
    height: 65px;
    background-color: black;
    z-index:99 !important;
    clear:both;
}

nav #ribbon {
    float: left;
    margin: 0px 50px;
    Width: 65px;
    height: 130px;
    background-color: red;
    z-index= 99;
}

Answer №1

In order to utilize z-index, it is important to specify a specific position (such as absolute, fixed, or relative).

The statement at the end is inaccurate:

z-index = 99;

The proper way to represent this is:

z-index: 99;

Answer №2

Check out this awesome solution here: http://jsfiddle.net/1qsuvhnd/30/

Simply change the ribbon to have a position of absolute and correct the typo where it says z-index =. Easy fix!

No need for any margin hack with this adjustment in place.

nav #ribbon {
    float: left;
    margin: 0px 50px;
    Width: 65px;
    height: 130px;
    background-color: red;
    z-index: 99;   /* Just remove the equal sign and replace with a colon */
    position: absolute;  /* Absolute positioning saves the day! */
}

Answer №3

In order for the z-index to function properly, you must define a position CSS rule for the navigation div. Here is an example of how to do so:

nav #ribbon {
    float: left;
    margin: 0px 50px;
    width: 65px;
    height: 130px;
    background-color: red;
    z-index:99;
    position: relative;
}

To see the changes in action, visit the updated jsFiddle link: http://jsfiddle.net/1qsuvhnd/54/

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