What is the best way to apply CSS styles to a child component in React?

When dealing with a simple HTML structure, achieving a certain layout is straightforward. But how can the same be done using React and Styled Components?

HTML

<div className="slider">
    <section>Content A</section>
    <section>Content B</section>
</div>

Styling the sections in HTML can be done like this.

.slider section {
   //some styling
};

But what about replicating the same setup in React with Styled Components? In this scenario, Slider is a styled component while SectionComponent is a React component as shown below.

<Slider>
    <SectionComponent text="Content A" />
    <SectionComponent text=" Content B" />
</Slider>

I attempted to style the SectionComponent within the Slider CSS but encountered issues.

Styled Component CSS

export const Slider = styled.div`
    //some css styling
    Slider SectionComponent {
        //styling of the SectionComponent
    }
`;

Answer №1

Typically, there's no need to make every element a component when using React and Styled Components. It's usually best to only do so if you want to take advantage of the additional features they offer.

In your scenario, this would look like:

   <Slider>
       <section>Content A</section>
       <section>Content B</section>
   </Slider>

You can then style your sections using styled components, for example:

  const Slider = styled.div`
      section {
         //styling of the section
      }
  `;

If you decide to turn the sections into components as well, you should still be able to follow the same approach. I've provided examples below with different forms of sections - the HTML element section, the styled component StyledSection, and the functional component SectionComponent that returns a <section>.

For a simple working demo, you can check out: https://codesandbox.io/s/react-fiddle-forked-5xt6p?file=/src/App.js

When dealing with CSS in your Styled Components, treat it as though you're working with regular CSS files and HTML elements. If your SectionComponent is nested within the Slider and is a <section>, you can target it just like you would with CSS.

Answer №2

Utilize string templates for styling:

export const Slider = styled.div`
  //apply css styles here

  ${SectionComponent} {
    //customize SectionComponent style
  }
`;

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