props simple example

App.jsx

import React from 'react'
import './App.css'

function MyButton(props) {
    return (
        <button style={{ backgroundColor: props.color }}>
        Нажми меня
        </button>
    );
}

export class MyHeader extends React.Component {
    render() {
        return <h1>Hello</h1>
    }
}

function App() {
    return (
        <>
            <MyButton color="red"/>
            <MyHeader/>
        </>
    )
}

export default App