How to set 4 border colors to be different in css

In css, you can use the border-top-color, border-bottom-color, border-left-color, and border-right-color properties to set the top border, bottom border, left border, and right border respectively. color.

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

css sets 4 borders with different colors

##Running effect:

Description:

• #border-top-color property can set the top border color

• border-bottom-color property can set the bottom border color

• border-left-color property can set the left border color

• border-right -The color attribute can set the right border color

CSS color

In css, the color value can There are four writing methods using color name, percentage, number and hexadecimal value.

1) Use color names

Although there are currently about 184 named colors, they are truly supported by various browsers and serve as CSS specifications There are only 16 recommended color names, as shown in the table below.

Table 1: Color names recommended by CSS specificationsNameColorName NameColorNameColor##black##blueLight bluegreenDark GreenlimeLight GreenIndigo##red大红purpleDeep PurplefuchsiaMagentayellow It is not recommended to use color names in web pages, especially for large-scale use , to avoid some color names not being parsed by browsers, or different browsers interpreting colors differently. 2) Use percentage

Pure black	silver	Light gray	navy	Dark blue
					##teal
aqua	天蓝	maroon	Crimson
				##olive	Brown Yellow
明黄	gray	Dark Gray		white	Shell White

This is the most common method, for example:

color: rgb(100%, 100%, 100%);

This statement will red, blue, The three primary colors of green are all set to their maximum values, and the resulting combination is displayed in white. Instead, you can set rgb(0%, 0%, 0%) to black. If the three percentage values ​​are equal, gray will be displayed. Similarly, whichever percentage value is larger will favor which primary color.

3) Use numerical values ​​

The number range is from 0 to 255, for example:

color: rgb(255, 255, 255);

The above statement will display white. On the contrary, it can be set to rgb(0, 0, 0), will display black. If the three values ​​are equal, the display will be gray. In the same way, whichever value is larger will have a greater proportion of which primary color.

4) Hexadecimal color

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

color: #ffffff;

Which should be in hexadecimal Add a # color symbol in front. The above statement will display white. On the contrary, you can set

#000000

to black, which is described by RGB:

color: #RRGGBB;

ranges from 0 to 255. In fact, 255 in decimal is exactly equal to hexadecimal. FF, a hexadecimal color value is equal to 3 groups of such hexadecimal values, which are equal to the three primary colors of red, blue, and green when connected together in order. (Learning video sharing: css video tutorial)

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