Troubleshooting: Why are CSS class selector styles not being applied in my React project

Currently working on a React project that involves using Webpack. I am adding some styles in my style.css file and importing it into components with the line import style from './style.css';. Interestingly, elements like body and div get styled properly without selectors. However, I am encountering difficulties when trying to style classes.

For instance, I set the className with

<div className='foo'>foo div</div>
.

This is the CSS code used:

.foo {
  height: 250px;
  width: 250px;
  background-color: blue !important;
}

body {
  background-color: red;
}

While the red background color correctly applies to the body, the .foo div does not receive any styling. When checking out the foo div in DevTools, its class name (

<div class="foo">foo div</div>
) is present and the stylesheet appears intact:

.foo {
  height: 250px;
  width: 250px;
  background-color: blue !important;
}

body {
  background-color: red;
}

I have been struggling to solve this issue for quite some time now, experimenting with various solutions. It seems that while all DOM elements are style-able, as soon as I attempt to target specific selectors, nothing gets applied...

Answer №1

It's possible that your webpack configuration is dynamically changing the class name depending on its settings, even though it seems CSS Modules are not enabled based on your intact stylesheet comment.

Instead of directly referencing the class name in your './style.css' file, try using a reference like: style.foo. For example:

<div className={ style.foo }>foo div</div>

You can find more information about this pattern of importing and referencing class names in this article: .

Answer №2

For individuals who tend to utilize the style attribute for formatting and then transfer them to appropriate classes in .css files (only to be puzzled when it doesn't function properly), it's important to remember to eliminate the JSX string format,

height: "100px"

is not the same as

height: 100px

Answer №3

Although Kyle's approach is functional, a more effective solution would involve renaming the css file to style.global.css and importing it using import './style.global.css'. This way, you can specify the class name just like in regular HTML, which proves beneficial when appending different class names dynamically.

<div className='foo'>foo div</div>

Answer №4

I have come up with a way to fix this issue by changing the name of the CSS file from:

style.css

to:

style.module.css

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