What is the syntax format of css

The definition of CSS consists of three parts: selector, properties, and property values.

The basic format is as follows:

selector{property:value} i.e.: (selector {property: value})

For CSS The definition of has the following requirements:

(1) Attributes and values ​​must be separated by colons. For example: body{color:blue}. The selector body refers to the main part of the page, color is the attribute that controls the text color, and black defines the color value. The effect of this example is to make the text on the page blue.

(2) If the value of an attribute consists of multiple words, the value must be enclosed in quotation marks. For example: p{font-family:"sans serif"}. In this example, the paragraph font is defined as sans serif. The name of the font consists of two words, so it must be enclosed in quotation marks.

(3) If you need to specify multiple attributes for a selector, you can use semicolons to separate all attributes and values. For example: p{text-align:center;color:red}. This example defines the arrangement of paragraphs in the play, and the text in the paragraphs is red.

(4) In order to make the defined style sheet easy to read, it is best to use a branched writing format for the definition of the style sheet. For example:

{
  text-align:center;
  color:black;
  font-family:arial
}

This example defines paragraph arrangement in the play. The text in the paragraph is black and the font type is arial.

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