Colors

Color is the fastest way to change how a page feels. CSS gives you several ways to say the same color — each with its moment.

Four ways to write a color

All four paragraphs are the same green:

Syntax	Example	Best for
Named	seagreen	quick experiments (about 148 names exist)
Hex	#2e8b57	the industry default — what design tools hand you
RGB	rgb(46, 139, 87)	when you're mixing light: red, green, blue 0–255
HSL	hsl(146, 50%, 36%)	human tweaking: hue°, saturation%, lightness%

Hex is what you'll see most: #RRGGBB, two hex digits per channel. #000000 is black, #ffffff white, #ff0000 pure red.

Where color applies

Transparency

Add an alpha channel — rgb(46, 139, 87, 0.5) or 8-digit hex #2e8b5780 — for glassy, layered effects. 0 is invisible, 1 fully solid.

What's next

Typography — the properties that make text worth reading.