Web & UI
CSS
Cascading Style Sheets (CSS) is a style sheet language used for describing the presentation of a document written in a markup language like HTML. CSS is a cornerstone technology of the World Wide Web, alongside HTML and JavaScript.
- Created by
- Håkon Wium Lie , Bert Bos
- First appeared
- 1996
- Official resource
- Visit the main website
Your first program
Hello, World!
/* Apply basic styling to the body element */
body {
color: white;
background-color: black;
font-family: Arial, sans-serif;
text-align: center;
}
/* Style for a 'Hello, World!' message */
.message {
font-size: 24px;
margin-top: 20px;
}Keep learning
Where to go from here
Use trusted documentation for facts and an AI tutor for personalized explanations.
Official resource
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Teach me the basics of CSS. Use https://code.study/css as the starting point. Explain what CSS is best suited for, when I should not choose it, how to install or try it, and then walk me through its Hello World example step by step.
Content reviewed August 2026 · Start with primary sources and verify version-specific details.