In Oracle APEX, you can apply CSS (Cascading Style Sheets) to customize the appearance and styling of your application. Here are some ways to work with CSS in Oracle APEX:

In Oracle APEX, you can apply CSS (Cascading Style Sheets) to customize the appearance and styling of your application. Here are some ways to work with CSS in Oracle APEX:

1. Inline CSS: You can apply CSS styles directly to individual components or regions in your application using inline CSS. In the component or region attributes, go to the "Inline CSS" section and enter your CSS styles.
2. CSS Classes: Define CSS classes in the "Inline CSS" section or in a separate CSS file, and then apply those classes to components or regions. You can add the class name in the "CSS Classes" attribute of the component or region.
3. Theme Roller: Oracle APEX provides a Theme Roller feature that allows you to customize the appearance of your application using a visual interface. You can modify colors, fonts, borders, and other visual elements.
4. Theme Stylesheets: APEX themes come with predefined CSS stylesheets that control the overall look and feel of your application. You can choose a theme and customize its CSS stylesheets to match your desired design.
5. Universal Theme Classes: Oracle APEX Universal Theme provides a set of predefined CSS classes that you can use to style your components consistently. These classes have specific names and can be applied to components or regions by adding them to the "CSS Classes" attribute.
6. Custom CSS Files: You can upload custom CSS files to your Oracle APEX application and reference them in your pages. These CSS files can be used to override or extend the default styles provided by the theme.
7. Dynamic Actions and JavaScript: You can use Dynamic Actions and JavaScript to dynamically apply or modify CSS styles based on user interactions or specific events. JavaScript libraries like jQuery and CSS manipulation functions can be utilized for this purpose.

By leveraging these methods, you can effectively style and customize your Oracle APEX application using CSS to achieve the desired visual presentation.