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 稱 顏 色 名 稱 顏 色 名 稱 顏 色 black 純黑 silver 淺灰 navy 深藍(lán) blue 淺藍(lán) green 深綠 lime 淺綠 teal 靛青 aqua 天藍(lán) maroon 深紅 red 大紅 purple 深紫 fuchsia 品紅 olive 褐黃 yellow 明黃 gray 深灰 white 殼白*/
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，即紅色 */
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%) /* 深綠色 */ hsl(120,100%,50%) /* 綠色 */ hsl(120,100%,75%) /* 淺綠色 */
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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