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To alter the CSS properties of a React-Bootstrap component in Next.js, you can use either of the following methods:

1. Use the built-in Bootstrap CSS file: a. Install the Bootstrap package: npm install bootstrap b. Import the Bootstrap CSS file in your _app.js file: import 'bootstrap/dist/css/bootstrap.min.css'; c. Override the CSS properties of the components using custom styles in your component file.

2. Use a CSS-in-JS library like styled-components or emotion: a. Install the CSS-in-JS library of your choice: npm install styled-components or npm install @emotion/react b. Import the library in your component file: import styled from 'styled-components'; or import { css } from '@emotion/react'; c. Create a styled version of the component and tweak the CSS properties as per your requirements.

Example using styled-components:

import React from 'react';
import styled from 'styled-components';
import { Button } from 'react-bootstrap';

const StyledButton = styled(Button)`
  background-color: #007bff;
  border-color: #007bff;

  &:hover {
    background-color: #0069d9;
    border-color: #0062cc;
  }
`;

const MyComponent = () => {
  return (
    <StyledButton>Click me!</StyledButton>
  );
};

export default MyComponent;