css Cascading Style Sheets

• Generally speaking, all styles have the following rules (the fourth one has the highest priority)
1. Browser default
Browser default
2. External style sheet
External style sheet
3 . Internal style sheet (inside the tag)
Inline style (inside an HTML element)
External style sheets allow you to change the appearance and layout of all that appear in your WEB, just by editing a single CSS document. (The principle is to change everything)

The syntax of CSS consists of three parts: a selector, a Attribute and a value, for example:
selector {property: value}

The selector is the element or label that needs to be defined

For example: body{color:red} Define the color attribute of the label body to red

If the value is Multiple words are enclosed in double quotes
For example: p {font-family: "sans serif"}

If you specify multiple attributes, each attribute must be separated by a semicolon
For example: p {text-align: center;color:red}

Each HTML element can only have one class attribute

You can use p.right {text-align: right} to modify the left and right p elements with the class attribute of right Or label

If you use .right{text-align: right} to modify all elements or labels whose class attribute is right, there is no meaning of specifically referring to a type of label or element.

id selector

css can use

#attribute{} to modify all id attributes to the same element or label similar to class. One is to use. The other is to use #
The attribute name of class id cannot start with a number, otherwise it will not work properly in Mozilla/Firefox

css comments /* */

Three ways to insert a style sheet
• External Style Sheet

• Internal Style Sheet

Use the

• Inline Styles

Use the style attribute on relevant tags to add inline styles. Style properties can contain any CSS property. The example will show how to add left spacing to a paragraph and change the color to red

This
is a paragraph