Objects on webpages can have three dimensions, y and x, and z. Dimension z gives websites a sense of depth by layering objects. With the addition of the z-index property in CSS2, divs and other elements can be layered on top of each other. The z-index property specifies the layer number of an element. Items on web pages are ordered with low z-indices in the back, and higher z-indices in the front.
In order for z-index to work properly, the element to which it is applied must also have a defined position, position: absolute, position: relative, or position: fixed (simply a position other than static). By default, z-index is determined by order in the code, i.e. elements later in the code appear on top of elements earlier in the code.
The z-index property has 4 possibilities for a value:
position: fixed; is a property that fixes an HTML element in a certain location in a window. As the user scrolls, the element remains in the same position in the window. This is commonly used
To create a fixed navbar, follow the instructions below:
Create navbar in HTML
Use the name of the navbar (in this example it will be fixed-navbar) to create a CSS rule
Create a rule for position, i.e. position: fixed;
Create a z-index for it, i.e. z-index: 100;
As long as you don’t create a stacking order, you have just created a fixed navbar using z-index. An example of the CSS that could be used is below.
For more information see: