What are the ways to establish the standard appearance and modify styles of buttons in React Bootstrap?

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Using the className prop: The className prop can be used to assign a CSS class to a button, which can then be styled using standard CSS rules.

Using the style prop: The style prop can be used to apply inline styles to a button, allowing for more fine-grained control over its appearance.

Using pre-defined styles: React Bootstrap includes a number of pre-defined styles for buttons, such as primary, secondary, success, danger, warning, and info. These can be applied using the variant prop.

Customizing button styles: React Bootstrap also provides a way to customize button styles by modifying the variables used in its underlying Sass files. This requires knowledge of Sass and may be more advanced, but allows for a more consistent customization across a project.

Using CSS Modules: CSS Modules provide a way to locally scope CSS styles to a particular component, preventing conflicts with other styles in the application. This approach can be used in combination with any of the above options to further refine the appearance of a button.