jQuery UI is primarily focused on the User Interface enhancements(hence the name jQuery UI ofcourse). Since its focussed on user interface enchancement, there is an option provided to style the inbuilt widgets in various ways to give it a particular look and feel.
This can be achieved by the themeing option also known as Theme Roller.
Check this link for more info - https://jqueryui.com/themeroller/
Video by - Tanmay Sakpal
Simple Snippets Channel link - https://www.youtube.com/simplesnippets
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