What's the deal with z-index not functioning properly?

Below is my simple HTML and CSS code:

HTML:

<div class="header">
    <div class="tip"></div>
</div>

CSS: 

.header {
    display: block;
    width: 260px;
    min-height: 222px;
    background-color: #252525;
    position: relative;
    z-index: 5;
    -webkit-box-shadow: 0 0 5px #000;
    -moz-box-shadow: 0 0 5px #000;
    box-shadow: 0 0 5px #000;
    border-radius: 2px;
}
.tip {
    display: inline-block;
    width: 10px;
    height: 10px;
    right: 11px;
    top: -5px;
    transform: rotateZ(45deg);
    position: absolute;
    z-index: 1;
    background-color: red;
    -webkit-box-shadow: 0 0 5px #000;
    -moz-box-shadow: 0 0 5px #000;
    box-shadow: 0 0 5px #000;

}

I am trying to position the .tip block under the .header block. However, despite setting the z-index of .tip lower than that of .header, it still appears on top:

This is the desired outcome:

The issue lies with the z-index not functioning as expected. I need to specify the z-index for the .header block due to other blocks on the page also having z-index values.

htmlcsspositionz-index

Answer №1

If you want the child of a parent element to have a higher z-index than the parent element, simply delete the parent's z-index value.

.header {
    display: block;
    width: 260px;
    min-height: 222px;
    background-color: #252525;
    position: relative;
    /*z-index: 5;*/ 
    -webkit-box-shadow: 0 0 5px #000;
    -moz-box-shadow: 0 0 5px #000;
    box-shadow: 0 0 5px #000;
    border-radius: 2px;
}
.tip {
    display: inline-block;
    width: 10px;
    height: 10px;
    right: 11px;
    top: -5px;
    transform: rotateZ(45deg);
    position: absolute;
    z-index: -1;
    background-color: red;
    -webkit-box-shadow: 0 0 5px #000;
    -moz-box-shadow: 0 0 5px #000;
    box-shadow: 0 0 5px #000;
}
<div class="header">
    <div class="tip"></div>
</div>

Answer №2

Consider adjusting the value of 1 to -1...and deleting z-index: 5 from the first block (header); inspect this segment of the code:

.header {
    display: block;
    width: 260px;
    min-height: 222px;
    background-color: #252525;
    position: relative;
    -webkit-box-shadow: 0 0 5px #000;
    -moz-box-shadow: 0 0 5px #000;
    box-shadow: 0 0 5px #000;
    border-radius: 2px;
}

.tip {
    display: inline-block;
    width: 10px;
    height: 10px;
    right: 11px;
    top: -5px;
    transform: rotateZ(45deg);
    position: absolute;
    z-index: -1;
    background-color: red;
    -webkit-box-shadow: 0 0 5px #000;
    -moz-box-shadow: 0 0 5px #000;
    box-shadow: 0 0 5px #000;

}

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