CSS Fundamentals

Topic Overview

The Anatomy of Style

Select and Declare Elements and Rules Property and Value The Anatomy of Style TODO

Style Guide

Where to Style The Style Attribute The Style Element The Style Document TODO

CSS Documents

Directory Placement The <link> Tag Relationship Type Href The <link> Element TODO

CSS Applied

Comments in CSS Understanding Styling Applying Style TODO

Selector Types

Universal Selectors Element Selectors Class Selectors ID Selectors TODO

Cascading

Cascading in CSS Rules Order Specificity Setting Importance TODO

Exploring Color

Specifying Color Color Names RGB Values Hex Codes Saturated Color Desaturated Color (Grayscale) Combining Colors TODO

Using Color

Background Color Text Color Opacity Basic Positioning Color Palettes TODO

Hex Codes

Hexadecimal (or hex) values, are written as a single string, prepended with a number sign, with digits for each color. #RRGGBB

CSS

/* Black as a hex code: */
p {
  color: #000000;
}

The major difference is that you can represent 256 values with a two-bit hexadecimal number. In hexadecimal numbering, each digit has 16 values (0-f). And, 16 * 16 = 256.

If we were translate this to binary:

Binary	Hex
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	a
11	b
12	c
13	d
14	e
15	f

So, in hex, we write the value:
`000` as `00`
`010` as `0a`
`015` as `0f`
`016` as `10`
`017` as `11`
`031` as `1f`
`032` as `20`
`050` as `32`
`100` as `64`
`150` as `96`
`200` as `c8`
`250` as `fa`
`255` as `ff`