Changing The CSS For A React Component Has Effect On All Other Pages

I have a React component with the following files: src/components/HomePage/index.js src/components/HomePage/style.scss The component is very simple: import React from 'react'; im

Solution 1:

If you want to localize CSS rules, then you would have to switch to modular stylesheets (works the same for sass stylesheets).

In your current structure, the component imports non-modular stylesheet and doesn't localize the changes with a unique identifier. Therfore added rules live in a global scope without a unique identifier that would localize them so that only selected components could understand them. That means that they are capable of easily overwriting the same-named rules which were previously established (import order matters here, because it would dictate how the bundler appends the output stylesheet).

So instead of holding component-related rules within ./style.scss file, rename it to ./index.module.scss and then you would utilize it within the component like so:

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

const HomePage = () => {
    return (
        <div className={style.homepage}>
            <h1 className={style.heading}>Landing page</h1>
        </div>
    );
};

export default HomePage;

and your stylesheet would look like:

.heading {
    color: #f3f3f3;
    font-family: "Cambria";
    font-weight: normal;
    font-size: 2rem;
}

disclaimer:

I've changed the styling convention from selecting elements by their tag, to selecting them by class, because targetting elements by tag is widely considered a bad practice [ref] , but if you want to maintain it, then you would have to provide a parent scope for such a rule (it already exists since the parent <div/> element has an assigned class. In this case the implementation would look like:

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

const HomePage = () => {
    return (
        <div className={style.homepage}>
            <h1>Landing page</h1>
        </div>
    );
};

export default HomePage;

and styles:

.homepage {
    h1 {
        color: #f3f3f3;
        font-family: "Cambria";
        font-weight: normal;
        font-size: 2rem;
    }
}

Solution 2:

You can either go with the easiest way that is mentioned below.

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

const HomePage = () => {
    return (
    <div className = "home">
            <div className="homepage">
                <h1>Landing page</h1>
            </div>
    </div>
    );
};

export default HomePage;

You can wrap whole html inside one div of particular component name

CSS:

.home h1 {
    color: #f3f3f3;
    font-family: "Cambria";
    font-weight: normal;
    font-size: 2rem;
}

This is the easiest way. However this is my personal solution because I also face the same issues when I was beginner at react.