reactCopyToClipBoard.js

import {CopyToClipboard} from 'react-copy-to-clipboard';

state = {
    showCopyText: null
  };

copyNumber = () => {
    this.setState({
        showCopyText: "bKash number copied to clipboard"
    });
    setTimeout(() => {
        this.setState({
            showCopyText: null
        });
    }, 2000)
  };

 <CopyToClipboard text={number}>
      <button onClick={this.copyNumber} className="copy-btn">Copy</button>
  </CopyToClipboard>