What CSS property prevents a fixed header from overlapping a scrolled element?

After creating a fixed header for my HTML table, I noticed that as I scroll down the page, everything is being overlapped by the fixed header except for one slider (noUiSlider). I am curious to know which CSS property is preventing the header from overlaying this slider.

Here is the CSS code for the fixed header:

#header-fixed { 
    position: fixed; 
    top: 0px;
    display:none;
    background-color:white;
} 

And here is the JavaScript code for the fixed header:

var tableOffset = $("#listView-tab").offset().top;
var $fixedHeader = $( "#header-fixed" );

$(window).bind("scroll", function() {
    var offset = $(this).scrollTop();

    if (offset >= tableOffset && $fixedHeader.is(":hidden")) {
        $fixedHeader.show();
    }
    else if (offset < tableOffset) {
        $fixedHeader.hide();
    }
});

The first image attached shows all the elements associated with the slider, while the second image illustrates how all other elements are overlapping except for the slider.

https://i.sstatic.net/rHR7g.png

https://i.sstatic.net/j2YH7.png

Answer №1

If you're aiming to achieve an overlapping effect between elements, make sure of the following:

z-index: 0

The element that should be displayed on top needs to have:

z-index: 1 or greater.

Answer №2

If you want to customize the overlapping order of elements, consider using the z-index property.

mdn source

The z-index property is useful when you need elements to be arranged in a specific order with different overlapping priorities than the default.

For example:

.bold {
    font-weight: bold;
    font: 12px Arial;
}
#div1,
#div3 {
    height: 80px;
    position: relative;
    border: 1px dashed #669966;
    background-color: #ccffcc;
    padding-left: 5px;
}
#div2 {
    opacity: 0.8;
    z-index: 1;
    position: fixed;
    width: 150px;
    height: 200px;
    top: 20px;
    left: 170px;
    border: 1px dashed #990000;
    background-color: #ffdddd;
    text-align: center;
}
#div4 {
    opacity: 0.8;
    z-index: 2;
    position: fixed;
    width: 200px;
    height: 70px;
    top: 65px;
    left: 50px;
    border: 1px dashed #000099;
    background-color: #ddddff;
    text-align: left;
    padding-left: 10px;
}
<div id="div1">
<br /><span class="bold">DIV #1</span>
<br />position: relative;
   <div id="div2">
   <br /><span class="bold">DIV #2</span>
   <br />position: fixed;
   <br />z-index: 1;
   </div>
</div>

<br />

<div id="div3">
<br /><span class="bold">DIV #3</span>
<br />position: relative;
   <div id="div4">
   <br /><span class="bold">DIV #4</span>
   <br />position: fixed;
   <br />z-index: 2;
   </div>
</div>

Answer №3

increase z-index

#header-fixed { 
            position: fixed; 
            top: 0px; display:none;
            background-color:white;
            z-index:9999;
            }

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