Introduction - If you have any usage issues, please Google them yourself
When it comes to the Qt component art, you first have to master the CSS cascading style sheet
Cascading style sheets (CSS) contain style rules that apply to elements in a web page. The CSS style defines how the element is displayed and where the element is placed in the page. You can create a general rule, as long as the Web browser encounters an element instance, or meet a is assigned to a specific class of style elements, the rules immediately apply the property, rather than by attributes assigned to each element in the page.