CSS Summary
You made it. Here's the whole CSS tutorial in one page — the ideas you'll reach for daily once you start writing real CSS.
The mental model
- Every element is a box (content, padding, border, margin).
box-sizing: border-boxglobally makes width predictable.- The cascade picks a winning rule by importance, specificity, then source order.
- Modern layout = Flexbox for one axis, Grid for two.
- Mobile-first responsive design + a few media queries handles every screen.
The 20 properties you'll use every week
| Visual | Layout | Type | Behaviour |
|---|---|---|---|
color |
display |
font-family |
transition |
background |
position |
font-size |
cursor |
border |
flex |
line-height |
pointer-events |
border-radius |
grid-template-columns |
text-align |
overflow |
box-shadow |
gap |
letter-spacing |
opacity |
What's next
- Move on to JavaScript to make pages interactive.
- Or jump to the website challenge and build something real.
- Bookmark the CSS Reference — it's faster than Google for property lookups.
Tip: CSS keeps shipping new features every year. Subscribe to a weekly newsletter (Frontend Focus, CSS Tricks digests) to stay current.
Example
Example
<!DOCTYPE html>
<html>
<head>
<style>
body { font-family: Verdana, sans-serif; }
.box { background: #04AA6D; color: #fff; padding: 20px; border-radius: 6px; }
</style>
</head>
<body>
<h1>CSS Summary</h1>
<div class="box">Edit the CSS on the left, then click Run »</div>
</body>
</html>
Try it Yourself »
Exercise
Universal reset to use almost everywhere is…
*, *::before, *::after { box-sizing:
; }
The modern default everybody sets.
Discussion
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