How to use color in CSS

In css, the color attribute is used in many places to make the html content colorful, such as: background-color; border-color;

The first one

The representation method is to write the color directly in English, for example: blue (blue), red (red), a total of 17 colors can be expressed (I will not give examples one by one here, it is meaningless!)

css example:

body{ padding: 0px;">

The second way to express

is to use yellow , green and blue values ​​set the value of color. For example: rgb (204,213,9), (r represents red, g represents green, b represents blue)

The first one in the brackets The first value is the red value, the second value is the green value, and the third value is the blue value, (each value ranges from 0 to 255)

css example:

　body{background-color: rgb (100,100,100)};

The third

representation method is to use yellow, green, The percentage of the blue value sets the color value. For example, rgb (20%, 20%, 0)

css example:

　body{

The fourth

representation method is to use the hexadecimal value of the color to set the value of the color; the hexadecimal color representation starts with #0123456789abcdef respectively represents the numbers 0~16, and the number after # One or two digits

represent the red value, three or four digits represent the green value, and the last two digits represent the blue value,

Example: #cc0066; cc represents the red part , 00 represents the green part, 66 represents the yellow part, the value of the red part is 12*16+12=204, 204 is the value of red

The value of the green part is 0*16+0=0, 0 is The value of the green part, the value of the blue part is 6*16+6=112; 112 is the value of blue

There may also be color representation methods such as #c06, because red, green, The two values ​​​​in the blue part are the same, and their value is #cc0066, and #c06 is its abbreviation; #a means

because all six values ​​​​are equal, and its value is #aaaaaa , #a is its abbreviation; #ccc also means #cccccc,

十六进制色标是6位，1和2同 , 3和4同 , 5和6同 才能缩写

#00ffee  ==>  #0fe
#0effed  ==>  #0efed
注意:字母不区分大小写, 但是一般都用小写

css example:

body{ background-color: #21439c};

The fourth method is most commonly used now because the expression method is relatively simple.

ps I don’t think it is necessary to know what color the color value displays during the development process, because it is too difficult. You can use certain tools to assist in selecting colors.

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