CSS Properties: How z-index property specify the z-order of an element

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HTML Code:

<!DOCTYPE html>
<title>How z-index property specify the z-order of an element</title>
<style type="text/css">
div {
 width: 100px;
 height: 100px;
 padding: 20px;
 .w3r1, .w3r2, .w3r3, .w3r4 {
 position: absolute;
 .w3r1 {
  background: #ccff00;
  outline: 5px solid #9900CC;
  top: 100px;
  left: 200px;
  z-index: 10;
  .w3r2 {
  background: #0f0fcc;
   outline: 5px solid #fff0CC;
   top: 50px;
   left: 75px;
    z-index: 100;
	.w3r3 {
	background: #cc00ff;
	outline: 5px solid #660066;
	top: 125px;
	left: 25px;
	 z-index: 150;
	 .w3r4 {
	 background: #00ffcc;
	 outline: 5px solid #FF0099;
	 top: 200px;
	 left: 350px;
	 z-index: 50;
	 <h3><strong>w3resource Tutorial</strong></h3>
	 <div class="w3r1">w3resource 1. z-index 10
	 <div class="w3r2">w3resource 2. z-index 100</div>
	 <div class="w3r3">w3resource 3. z-index 150</div>
	 <div class="w3r4">w3resource 4. z-index 50</div>

Live Demo :

See the Pen z-index-answer by w3resource (@w3resource) on CodePen.

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HTML-CSS: Tips of the Day

CSS strikethrough different color from text?

Yes, by adding an extra wrapping element. Assign the desired line-through color to an outer element, then the desired text color to the inner element. For example:

<span style='color:red;text-decoration:line-through'>
  <span style='color:black'>black with red strikethrough</span>


<strike style='color:red'>
  <span style='color:black'>black with red strikethrough<span>

(Note, however, that <strike> is considered deprecated in HTML4 and obsolete in HTML5. The recommended approach is to use <del> if a true meaning of deletion is intended, or otherwise to use an <s> element or style with text-decoration CSS as in the first example here.)