How to override a React component's CSS using emotion CSS?

All we need is an easy explanation of the problem, so here it is.

In the below example, how to apply background-color:green to the <Test/> component without having to edit the <Test/> component directly?

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


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

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

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

Test must use className prop which generated by css-in-js library (emotion in this case):

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

Therefore:

// Will use the styling defined in `Test` component (default)
<Text/>

// Will use the defined styling and override the default when possible, 
// or add additional styling.
// i.e using background-color will override it
// using background-border will *add* a style
<Text css={...}/>

// Same as above, usually used with 3rd party css.
<Text className="someOtherCss" />

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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