block2.js

import styled from "styled-components";

const StyledCircle = styled.svg`
  fill: red;
`;

const circle = (
  <StyledCircle height="100" width="100">
    <circle cx="50" cy="50" r="40" stroke="black" stroke-width="3" fill="red" />
  </StyledCircle>
);

function App() {
  return <div className="App">{circle}</div>;
}