Lecture 24 CSS Tutorial Visibility and Z index

The CSS visibility property is used to specify whether an element is visible or not. Note: An invisible element also take up the space on the page. By using display property you can create invisible elements that don't take up space.
What is z-index? z-index is the CSS property that controls the stacking order of overlapping elements on a page. An element with a higher z-index value will appear in front of an element with a lower z-index value. The property is called “z-index” because it sets the order of elements along the z-axis.