CSS Introduction
CSS is the language we use to style a Web page.
What is CSS?
- CSS stands for Cascading Style Sheets
- CSS describes how HTML elements are to be displayed on screen, paper, or in other media
- CSS saves a lot of work. It can control the layout of multiple web pages all at once
- External stylesheets are stored in CSS files
CSS Demo — One HTML Page — Multiple Styles!
Here we will show one HTML page displayed with four different stylesheets. Click on the "Stylesheet 1", "Stylesheet 2", "Stylesheet 3", "Stylesheet 4" links below to see the different styles:
Why Use CSS?
CSS is used to define styles for your web pages, including the design, layout and variations in display for different devices and screen sizes.
CSS Example
body {
background-color: lightblue;
}
h1 {
color: white;
文本对齐：居中；
}
p {
font-family: verdana;
font-size: 20px;
}
亲自尝试 »CSS Solved a Big Problem
HTML was NEVER intended to contain tags for formatting a web page!
HTML was created to describe the content of a web page, like:
<h1>This is a heading</h1>
<p>This is a paragraph.</p>
When tags like <font>, and color attributes were added to the HTML 3.2 specification, it started a nightmare for web developers. Development of large websites, where fonts and color information were added to every single page, became a long and expensive process.
To solve this problem, the World Wide Web Consortium (W3C) created CSS.
CSS removed the style formatting from the HTML page!
If you don't know what HTML is, we suggest that you read our HTML 教程.
CSS Saves a Lot of Work!
The style definitions are normally saved in external .css files.
With an external stylesheet file, you can change the look of an entire website by changing just one file!
The richest people in the World
Who do you think are the richest people in the world? Right! These are those who are related to modern information technologies and design!
Here are the TOP 10 richest people in the world, according to Forbs magazine as of February 2024.
- Bernard Arnault & family - $216.6B: is a French businessman, investor and art collector. He is the founder, chairman and CEO of LVMH, the world's largest luxury goods company. Arnault is the richest person in the world, with estimated net worth of US $218 billion as of 10 February 2024, according to Forbes.
- Elon Musk - $198.9B: is a businessman and investor. He is the founder, chairman, CEO, and CTO of SpaceX; angel investor, CEO, product architect, and former chairman of Tesla, Inc.; owner, chairman, and CTO of X Corp.; founder of the Boring Company and xAI; co-founder of Neuralink and OpenAI; and president of the Musk Foundation.
- Jeff Bezos - $192.5B: is an American businessman, media proprietor and investor. He is the founder, executive chairman, and former president and CEO of Amazon, the world's largest e-commerce and cloud computing company.
- Mark Zuckerberg - $166.6B: is an American businessman and philanthropist. He co-founded the social media service Facebook, along with his Harvard roommates in 2004, and its parent company Meta Platforms (formerly Facebook, Inc.), of which he is an executive chairman, chief executive officer and controlling shareholder.
- Larry Ellison - $142.1B: is an American businessman and entrepreneur who co-founded software company Oracle Corporation. He was Oracle's chief executive officer from 1977 to 2014 and is now its chief technology officer and executive chairman.
- Warren Buffett - $131.2B: is an American businessman, investor, and philanthropist who currently serves as the co-founder, chairman and CEO of Berkshire Hathaway. As a result of his immense investment success, Buffett is one of the best-known investors in the world.
- Bill Gates - $124,8B: is an American businessman, investor, philanthropist, and writer best known for co-founding the software giant Microsoft, along with his childhood friend Paul Allen. During his career at Microsoft, Gates held the positions of chairman, chief executive officer (CEO), president, and chief software architect, while also being its largest individual shareholder until May 2014.[2][a] He was a prominent pioneer of the microcomputer revolution of the 1970s and 1980s.
- Larry Page - $122.1B: is an American businessman, computer scientist and internet entrepreneur best known for co-founding Google with Sergey Brin.
- Steve Ballmer - $120.1B: is an American businessman and investor who was the chief executive officer of Microsoft from 2000 to 2014. He is the owner of the Los Angeles Clippers of the National Basketball Association (NBA). He is a co-founder of Ballmer Group, a philanthropic investment company.
- Sergey Brin - $117.0B: is an American businessman best known for co-founding Google with Larry Page. Brin was the president of Google's parent company, Alphabet Inc., until stepping down from the role on December 3, 2019. He and Page remain at Alphabet as co-founders, controlling shareholders and board members.
CSS — Introduction
This video is a short introduction to CSS.
Part of a series of video tutorials to learn CSS for beginners!
