How can i use css pseudo elements styling inside react jsx to pass variables

In React, you can use CSS pseudo-elements with variables by using the styled component from styled-components library. Here's an example:

import styled from 'styled-components';

const Container = styled.div`
  position: relative;
  &::after {
    content: '${props => props.message}';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: ${props => props.color};
    opacity: 0.5;
  }
`;

function MyComponent() {
  return (
    <Container message="Hello World!" color="#ff0000">
      <p>This is a paragraph of text.</p>
    </Container>
  );
}

In this example, we define a Container component using the styled component from styled-components. We use the &::after pseudo-element to style the container's after pseudo-element.

We pass two props to the Container component: message and color. We use the props object to access these props inside the CSS styles.

In the CSS styles, we use template literals to insert the values of the message and color props. The ${props => props.message} syntax is called a "template literal" and allows us to insert the value of the message prop into the CSS styles.

When we render the MyComponent component, we pass the message and color props to the Container component:

function MyComponent() {
  return (
    <Container message="Hello World!" color="#ff0000">
      <p>This is a paragraph of text.</p>
    </Container>
  );
}

The resulting HTML will have the ::after pseudo-element styled with the values of the message and color props:

<div style="position: relative;">
  <p>This is a paragraph of text.</p>
  <div style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; background-color: #ff0000; opacity: 0.5;">
    Hello World!
  </div>
</div>

Note that the styled component from styled-components is a powerful tool that allows you to write CSS styles as JavaScript code. It's a great way to manage your CSS styles in a React application.