Tips on replacing a React component's styling with emotion CSS

Is there a way to incorporate the background-color:green style to the <Test/> component in the following example without directly modifying the <Test/> component?

/** @jsx jsx */
import { css, jsx } from "@emotion/core";
import React from "react";


const Test = () => (
    <div
        css={css`
            height: 100px;
            width: 100px;
            background-color: aqua;
        `}
    >
        Text
    </div>
);

const App = () => (
    <Test
        css={css`
            height: 400px;
            width: 400px;
            background-color: green;
        `}
    />
);

Answer №1

Experiment should utilize the className attribute provided by a css-in-js library (such as emotion):

function Experiment({ className }) {
  return (
    <div
      className={className}
      css={css`
        height: 100px;
        width: 100px;
        background-color: aqua;
      `}
    >
      Text
    </div>
  );
}

Thus:

// Will apply the styling defined in the `Experiment` component by default
<Text/>

// Will use the specified styling and override the default where applicable, 
// or include additional styling.
// For example, using background-color will override it
// while using border-color will *add* a style
<Text css={...}/>

// Similar to the above, often used with external CSS.
<Text className="someOtherCss" />

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