What is CSS and what does CSS stand for?
What is CSS? CSS stands for Cascading Style Sheets — the language that styles HTML. Our What is CSS? lesson explains the cascade, selectors and why color vs background-color matters, with a live preview.
CSS • 12 lessons
Make your pages look good.
Style your pages with colors, layouts and animation.
12 lessons · 12 live examples · 100% free
Preview — CSS
body { background: #f8fafc; color: #1e293b; } h1 { color: #2563eb; text-align: center; }
style.cssflexboxgrid
CSS tutorial
Learn CSS the right way — from color to layout
Searching for css tutorial or learn css? This 12-lesson track is a complete, free CSS tutorial for beginners — with live editor on every lesson.
CSS tutorial for beginners — colors, box model, Flexbox & Grid
Learn css tutorial (176 weekly impressions) step by step: colors and gradients, the box model, Flexbox and Grid for real layouts, positioning and media queries. Each lesson shows the effect instantly — perfect if you want to learn CSS for responsive sites. See Box Model, Flexbox, Grid.
- css tutorial • css basics • learn css
- css colors • css box model • flexbox • grid
Build responsive pages that work on any screen
In Media Queries and Positioning you make layouts that adapt to phones and desktops. Add Animations and Variables for polish.
Why this track
Why learn CSS with HtmlRunner?
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See color & layout live
Change a hex code and watch the preview repaint — no save, no refresh.
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Modern layout, not floats
We teach Flexbox and Grid — the way real sites are built today.
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Private & free
No signup. All CSS renders in your browser.
Jiyasrul Alom Juwel
Founder, HtmlRunner — building free tools for everyone. About the author →
Curriculum
CSS curriculum
Follow in order or jump to any lesson. Every lesson has a live editor.
All Lessons
12 lessons
All 12 lessons
01What is CSS?→02Colors→03Selectors→04Box Model→05Flexbox→06Grid→07Positioning→08Animations→09Media Queries→10Pseudo-classes→11Variables→12Gradients→
FAQ
CSS FAQ
CSS stands for Cascading Style Sheets — it styles HTML.
Use <link rel="stylesheet" href="style.css"> in the head. See What is CSS?
Flexbox is for one-dimensional rows, Grid for two-dimensional layouts. Both are in this track.
No — all CSS lessons run in your browser.