You can add a custom CSS to an element, page or site.
Add custom CSS to an element
- Select an element by clicking it or selecting it from the Navigator.

 - In the panel, click the Advanced tab.

 - Scroll down and expand Custom CSS.

 - In the text box that opens, enter the CSS code.
 
Add custom CSS to a page
- Go to the Page Settings panel.

 - Click the Advanced tab.

 - In the text box that opens, enter the CSS code.
 
Add custom CSS to the site
- Go to the Site Settings panel.

 - Select Custom CSS from the list.

 - In the text box that opens, enter the CSS code.
 
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- Custom CSS in Elementor
 - How to add Custom CSS
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 - CSS classes in Elementor