const root = document.getElementById("root");

// Btn
function Btn(props) {
  return <button style={{
      backgroundColor:"tomato",
      color:"white",
      padding:"10px 20px",
      border:0,
      borderRadius:10
    }}>
    
    {props.text}
  </button>
}

// Btn2 : shortcut
function Btn2({text, big}) {
  return <button style={{
      backgroundColor:"green",
      color:"white",
      padding:"10px 20px",
      border:0,
      borderRadius:10,
      fontSize: big ? 18 : 10
    }}>
    
    {text}
  </button>
}

// App
function App() {
  
  return (
    <div>
      <Btn text="Save changes" />
      <Btn text="Continue" />
      <Btn2 text="Save changes" big={true} />
      <Btn2 text="Continue" big={false} />
    </div>
  );
}

ReactDOM.render(<App />, root);