text: import React from "react";
  import "./Screen.css";
  import PropTypes from "prop-types";
  class Screen extends React.Component{
      render(){
          return(
              <div className="screen">
              <div>{this.props.value}</div>
              </div>
          )
      }
  }
  Screen.propTypes={
      value:PropTypes.string
  };
  export default Screen;