Use CSS pseudo-elements: before and: after to insert content before and after the document without changing the original structure of the document. There is a good example below, you can refer to it
Use CSS pseudo-elements: before and :after can insert content before and after the document without changing the original structure of the document. Combined with box-shadow, it can achieve very cool effects.
Here are three examples:
1. Use :before and :after to add Background, such as putting quotation marks before and after a piece of text;
2. Use: before, :after, box-shadow to achieve 3D shadow effect;
3. Use: before, :after, box-shadow to achieve photo overlay effect.
<!DOCTYPE html>
<html>
<head>
<title>Pseudo Demo</title>
<style>
body{background-color:#ccd3d7;padding:40px;}
h2{display:block;border-bottom:1px solid #ddd;padding:15px;}
p.myquote{padding:1em;font-size:16px;margin:8px 1em;position:relative;color:blue;line-height:1.7em;}
p.myquote:before,p.myquote:after{font-size:40px;position:absolute;padding:0;margin:0;color:green;}
p.myquote:hover:before,p.myquote:hover:after{color:red;font-size:50px;}
p.myquote:before{content:"“";left:0;left:-10px;}
p.myquote:after{content:"”";padding-left:15px;bottom:4px;}
.shbox{
background:#fff;
padding:10px;
width:90%;
margin:40px auto;
height:auto;
margin:40px auto;
}
.sh-down-lr{position:relative;}
.sh-down-lr:before,.sh-down-lr:after{
z-index: -1;
position: absolute;
content: "";
bottom: 15px;
left: 10px;
width: 50%;
top: 80%;
max-width:300px;
background: #777;
-webkit-box-shadow: 0 15px 10px #777;
-moz-box-shadow: 0 15px 10px #777;
box-shadow: 0 15px 10px #777;
-webkit-transform: rotate(-3deg);
-moz-transform: rotate(-3deg);
-o-transform: rotate(-3deg);
-ms-transform: rotate(-3deg);
transform: rotate(-3deg);
}
.sh-down-lr:after{
-webkit-transform: rotate(3deg);
-moz-transform: rotate(3deg);
-o-transform: rotate(3deg);
-ms-transform: rotate(3deg);
transform: rotate(3deg);
right:10px;
left:auto;
}
.stackone {
border: 6px solid #fff;
width: 400px;
height:225px;
margin: 50px;
position: relative;
-webkit-box-shadow: 2px 2px 5px rgba(0,0,0,0.3);
-moz-box-shadow: 2px 2px 5px rgba(0,0,0,0.3);
box-shadow: 2px 2px 5px rgba(0,0,0,0.3);
}
.stackone img{width:100%;heigth:100%;}
.stackone:before,.stackone:after {
content: "";
width: 400px;
height:225px;
background: #aaa;
border: 6px solid #fff;
position:absolute;
z-index:-1;
top:0;
left:-10px;
-webkit-box-shadow: 2px 2px 5px rgba(0,0,0,0.3);
-moz-box-shadow: 2px 2px 5px rgba(0,0,0,0.3);
box-shadow: 2px 2px 5px rgba(0,0,0,0.3);
-webkit-transform: rotate(-5deg);
-moz-transform: rotate(-5deg);
-o-transform: rotate(-5deg);
-ms-transform: rotate(-5deg);
transform: rotate(-5deg);
}
.stackone:after {
top:5px;
left:0;
-webkit-transform: rotate(3deg);
-moz-transform: rotate(3deg);
-o-transform: rotate(3deg);
-ms-transform: rotate(3deg);
transform: rotate(3deg);
}
</style>
</head>
<body>
<p class="shbox sh-down-lr">
<h2 id="CSS-nbsp-Demo-nbsp-before-nbsp-after-nbsp-box-shadow">CSS Demo :before, :after, box-shadow</h2>
<p>人最宝贵的是生命。生命属于人只有一次。人的一生应当这样度过：当回忆往事的时候，他不会因为虚度年华而悔恨，也不会因为碌碌无为而羞愧.</p>
<p>钢是在烈火里燃烧、高度冷却中炼成的，因此它很坚固。我们这一代人也是在斗争中和艰苦考验中锻炼出来的，并且学会了在生活中从不灰心丧气。</p>
</p>
<p style="background:none;">
<p>
<img src="/static/imghwm/default1.png" data-src="http://photos.tuchong.com/392707/f/6512410.jpg" class="lazy" / alt="About the application of CSS pseudo elements" >
<p>
</p>
</body>
</html>Achievement effect: 
The above is the entire content of this article. I hope it will be helpful to everyone’s learning. For more related content, please pay attention to the PHP Chinese website !
Related recommendations:
About the grid system principle of bootstrap3.0
Sharing about how to control the background with css
How to use CSS to control front-end image HTTP requests
The above is the detailed content of About the application of CSS pseudo elements. For more information, please follow other related articles on the PHP Chinese website!
What is CSS Grid?Apr 30, 2025 pm 03:21 PMCSS Grid is a powerful tool for creating complex, responsive web layouts. It simplifies design, improves accessibility, and offers more control than older methods.
What is CSS flexbox?Apr 30, 2025 pm 03:20 PMArticle discusses CSS Flexbox, a layout method for efficient alignment and distribution of space in responsive designs. It explains Flexbox usage, compares it with CSS Grid, and details browser support.
How can we make our website responsive using CSS?Apr 30, 2025 pm 03:19 PMThe article discusses techniques for creating responsive websites using CSS, including viewport meta tags, flexible grids, fluid media, media queries, and relative units. It also covers using CSS Grid and Flexbox together and recommends CSS framework
What does the CSS box-sizing property do?Apr 30, 2025 pm 03:18 PMThe article discusses the CSS box-sizing property, which controls how element dimensions are calculated. It explains values like content-box, border-box, and padding-box, and their impact on layout design and form alignment.
How can we animate using CSS?Apr 30, 2025 pm 03:17 PMArticle discusses creating animations using CSS, key properties, and combining with JavaScript. Main issue is browser compatibility.
Can we add 3D transformations to our project using CSS?Apr 30, 2025 pm 03:16 PMArticle discusses using CSS for 3D transformations, key properties, browser compatibility, and performance considerations for web projects.(Character count: 159)
How can we add gradients in CSS?Apr 30, 2025 pm 03:15 PMThe article discusses using CSS gradients (linear, radial, repeating) to enhance website visuals, adding depth, focus, and modern aesthetics.
What are pseudo-elements in CSS?Apr 30, 2025 pm 03:14 PMArticle discusses pseudo-elements in CSS, their use in enhancing HTML styling, and differences from pseudo-classes. Provides practical examples.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Zend Studio 13.0.1
Powerful PHP integrated development environment
SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.
SublimeText3 English version
Recommended: Win version, supports code prompts!
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
