What causes one CSS file's properties to be inherited by another CSS file in a React application?

Question

What causes one CSS file's properties to be inherited by another CSS file in a React application?

I'm puzzled as to why my hero section file seems to be adopting the styling from the navbar CSS file. I do understand that the index.css file sets properties for the entire app, but in my case, I have separate CSS files for different components instead of using that one. A specific issue I've encountered involves the img tag - where I've applied different styles in both hero.css and navbar.css files, yet somehow the hero.css file is picking up the properties defined in the navbar.css file's img tag. Has anyone else experienced this problem, and if so, how did you resolve it?

This question isn't necessarily looking for a quick fix by renaming elements, but rather seeks to gain an understanding of why this cross-styling between CSS files is happening.

javascript html css reactjs

Answer 1

Answer №1

If you're using React and have a style with the same selector, such as 'img', even if it's in a different file, both sets of rules will be applied to all matching elements in the document.

One way to avoid this is to separate the styles using css modules:

// Import the styles in your component file
import styles from './Hero.module.css';

// Use the imported styles in your JSX
<div className={styles.heroImage}></div>

Answer 2

If you're using React and have a style with the same selector, such as 'img', even if it's in a different file, both sets of rules will be applied to all matching elements in the document.

One way to avoid this is to separate the styles using css modules:

// Import the styles in your component file
import styles from './Hero.module.css';

// Use the imported styles in your JSX
<div className={styles.heroImage}></div>

Answer 3

Answer №2

When working with React, all CSS and components are contained within a single HTML file for seamless integration. For unique CSS files, consider using CSS modules. More information can be found at: https://create-react-app.dev/docs/adding-a-css-modules-stylesheet/

import React from 'react';
import styles from "./my-styles.module.css";

const MyComponent = () => {
  return (
    <div className={styles.container}>
      <h1 className={styles.redHeader}>Hello World!</h1>
      <h2 className={styles.grayHeader}>This text is gray</h2>
    </div>
  );
};

If you prefer not to use CSS modules, another option is styled components. Here's an example:

import React from 'react';
import styled from 'styled-components';

const Container = styled.div`
  padding: 10px 20px;
  text-align: center;
`;

const RedHeader = styled.h1`
  color: red;
  font-size: 48px;
`;
const GrayHeader = styled.h2`
  color: gray;
  font-size: 32px;
`;

const MyComponent = () => {
  return (
    <Container>
      <RedHeader>Hello World!</RedHeader>
      <GrayHeader>This text is gray</GrayHeader>
    </Container>
  );
};

Answer 4

When working with React, all CSS and components are contained within a single HTML file for seamless integration. For unique CSS files, consider using CSS modules. More information can be found at: https://create-react-app.dev/docs/adding-a-css-modules-stylesheet/

import React from 'react';
import styles from "./my-styles.module.css";

const MyComponent = () => {
  return (
    <div className={styles.container}>
      <h1 className={styles.redHeader}>Hello World!</h1>
      <h2 className={styles.grayHeader}>This text is gray</h2>
    </div>
  );
};

If you prefer not to use CSS modules, another option is styled components. Here's an example:

import React from 'react';
import styled from 'styled-components';

const Container = styled.div`
  padding: 10px 20px;
  text-align: center;
`;

const RedHeader = styled.h1`
  color: red;
  font-size: 48px;
`;
const GrayHeader = styled.h2`
  color: gray;
  font-size: 32px;
`;

const MyComponent = () => {
  return (
    <Container>
      <RedHeader>Hello World!</RedHeader>
      <GrayHeader>This text is gray</GrayHeader>
    </Container>
  );
};

What causes one CSS file's properties to be inherited by another CSS file in a React application?

Answer №1

Answer №2

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