There are several ways to write css colors

There are 4 ways to write css colors: 1. Use color names, such as red, black, gray, etc.; 2. Use hexadecimal values, such as "#FF0033"; 3. RGB or RGBA values, such as "rgb(255,0,51)"; 4. HSL or HSLA value, for example "hsl(120,100%,25%)".

The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.

Several ways to write css colors

1. Use color names

Although it has been There are about 184 named colors, but there are only 16 color names that are actually supported by various browsers and recommended as CSS specifications, as shown in the table below.

Table 1: Color names recommended by CSS specifications

/*名 称	颜 色	名 称	颜 色	名 称	颜 色
black	纯黑	silver	浅灰	navy	深蓝
blue	浅蓝	green	深绿	lime	浅绿
teal	靛青	aqua	天蓝	maroon	深红
red	大红	purple	深紫	fuchsia	品红
olive	褐黄	yellow	明黄	gray	深灰
white	壳白*/

It is not recommended to use color names in web pages, especially large-scale use, to avoid that some color names are not parsed by the browser, or are different Differences in how browsers interpret colors.

[Recommended tutorial: CSS video tutorial]

2. Hexadecimal color

Hexadecimal symbols #RRGGBB and #RGB (like #ff0000). "#" followed by 6 or 3 hexadecimal characters (0-9, A-F).

This is the most commonly used color selection method, for example:

#f03
#F03
#ff0033
#FF0033

3, RGB, red-green-blue (RGB)

The color value is specified as the color of the rgb code. The function format is rgb(R,G,B), and the value can be an integer or percentage from 0-255.

rgb(255,0,51)
rgb(255, 0, 51)
rgb(100%,0%,20%)
rgb(100%, 0%, 20%)

Extensions: RGBA, Red-Green-Blue-Alpha (RGBa)

RGBA extends the RGB color mode to include an alpha channel, allowing the transparency of a color to be set. a represents transparency: 0=transparent; 1=opaque.

rgba(255,0,0,0.1)    /* 10% 不透明 */  
rgba(255,0,0,0.4)    /* 40% 不透明 */  
rgba(255,0,0,0.7)    /* 70% 不透明 */  
rgba(255,0,0,  1)    /* 不透明，即红色 */

4. HSL, hue-saturation-lightness (Hue-saturation-lightness)

Hue (Hue) represents the color circle (that is, a circle representing a rainbow) ring) at an angle.
Saturation and brightness are expressed as percentages.
100% is full saturation, while 0% is a grayscale.
100% lightness is white, 0% lightness is black, and 50% lightness is "normal".

hsl(120,100%,25%)    /* 深绿色 */  
hsl(120,100%,50%)    /* 绿色 */       
hsl(120,100%,75%)    /* 浅绿色 */

Extension: HSLA, Hue-Saturation-Lightness-Alpha (HSLa)

HSLa extends from the HSL color mode and includes the alpha channel, which can specify the transparency of a color. a represents transparency: 0=transparent; 1=opaque.

hsla(240,100%,50%,0.05)   /* 5% 不透明 */   
hsla(240,100%,50%, 0.4)   /* 40% 不透明 */  
hsla(240,100%,50%, 0.7)   /* 70% 不透明 */  
hsla(240,100%,50%,   1)   /* 完全不透明 */

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