block8.js

...

import styled, { keyframes } from 'styled-components'

const rotate = keyframes`
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
`;

const StyledLogo = styled(ReactLogo)`
animation: ${rotate} infinite 20s linear;
height:25rem;
width:25rem;
display:block;
margin:auto;
`

class App extends Component {
  render() {
    return (
      <StyledLogo />
    );
  }
}

export default App;