To change the font size in CSS, you can use the font-size attribute, such as [font-size:smaller;], which means to set the font to a smaller size than the parent element. If we need to set the font size to a fixed value, we can use [font-size:length;].

The operating environment of this article: windows10 system, css 3, thinkpad t480 computer.

There is a property font-size in css specially used to set the font size. We can use this property to set the font size ourselves.

Attribute value:

• smaller Set font-size to a smaller size than the parent element.

• larger Set font-size to a larger size than the parent element.

• #length Set font-size to a fixed value.

• % Set font-size to a percentage value based on the parent element.

• #inherit Specifies that the font size should be inherited from the parent element.

(Learning video sharing:css video tutorial)

Example:

      
  
This is heading 1
 
This is heading 2
 
This is a paragraph.
  

Running result:

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