src/components/Showcase.tsx

import React from 'react';

 const Showcase = ({children}) => (
    <div
      style={{
        margin: '20px 0',
        overflow: 'hidden',
        borderRadius: '5px',
        backgroundColor: 'silver',
        width: '90%'
      }}>
      {children}
    </div>
);

export default Showcase