Sass style in React involves using the Sass (Syntactically Awesome Style Sheets) preprocessor to write more maintainable and reusable CSS.
This includes features like variables, nesting, mixins, and functions. To set it up, you install Sass, rename your CSS files to .scss, and import these Sass files into your React components. This setup enhances the styling capabilities in React applications, allowing for more structured and efficient CSS management.

 

• npm install sass 

• Create a Sass file (App.scss):
   

  // src/App.scss
  $primary-color: #4CAF50;
  $font-stack: Helvetica, sans-serif;
  
  .app {
    font-family: $font-stack;
    text-align: center;
  
    .header {
      background-color: $primary-color;
      color: white;
      padding: 20px;
  
      .title {
        font-size: 2em;
        margin: 0;
      }
    }
  
    .content {
      padding: 20px;
    }
  }
  

• Import the Sass file in a React component (App.js):

  // src/App.js
  import React from 'react';
  import './App.scss';
  
  function App() {
    return (
      
  
        
  
          
  Welcome to My React App
        
        
  
          
  This is a sample application styled with Sass.
        
      
    );
  }
  
  export default App;
  

   

 implementation of the Button component in a typescript version:
 

 import React from 'react';
import './styles.scss';

interface ButtonProps {
  text: string;
}

const Button: React.FC = ({ text }) => {
  return {text};
};

export default Button;

we define an interface ButtonProps to type-check the props passed to the Button component. The Button component is defined as a functional component that accepts the text prop of type string. We use the React.FC generic type to define the functional component and specify the type of props it accepts. 

// styles.scss

$primary-color: #2196f3;

.button {
  background-color: $primary-color;
  color: white;
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

// Button.jsx

import React from 'react';
import './styles.scss';

const Button = ({ text }) => {
  return {text};
};

export default Button;

we define a Sass variable for the primary color and use it in the .button style. We then import the styles.scss file in the Button.jsx component and use the .button class for the button element. 

Sass can be used to write the styles for the components. This makes it easier to manage the styles and keep them organized. Sass styles can be used in React by installing the Sass compiler and configuring the build process to compile the Sass files into CSS. To use Sass in a React project, you can create a .scss file for each component and write the styles using Sass syntax. You can then import the Sass file in the component's JavaScript file using the import statement.

It stands for "Syntactically Awesome Style Sheets". Sass provides several features that are not available in plain CSS, such as variables, nesting, and mixins.

SCSS stands for Sassy Cascading Style Sheets or Sassy CSS. It is a superset of the CSS language. It is also used as a file extension for SASS(syntactically awesome style sheets). SCSS Code are executed on the server and sends CSS to the browser. In SCSS, we can create dynamic css using the variable, conditions, looping etc. In this tutorial we will learn how to use SCSS in react.

if want to use Install Sass by running this command in your terminal:

>npm i sass

Sass files have the file extension .scss.

Create a variable to define the color of the text:

$myColor: red;

h1 {
  color: $myColor;
}

Import the Sass file the same way as you imported a CSS file:

index.js:

import React from 'react';
import ReactDOM from 'react-dom/client';
import './my-sass.scss';

const Header = () => {
  return (
    <>
      
Hello Style!
      
Add a little style!.
    
  );
}

const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
);

Please check the below links

https://www.creativebloq.com/web-design/what-is-sass-111517618
https://www.w3schools.com/react/react_sass_styling.asp
https://www.geeksforgeeks.org/how-to-style-with-sass-scss-in-react/