<div id="app"></div>
.App {
  font-family: sans-serif;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

.modal {
  position: relative;
  width: 20%;
  height: 20%;
  border: solid 0.1rem;
  padding: 0rem;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  align-items: center;
  background-color: white;
}

.xButton {
  padding: 5px 10px;
  margin: 5px;
  position: absolute;
  left: 0;
  top: 0;
  cursor: pointer;
  background: lightgray;
  font-size: 13px;
  border: none;
}

.modalContent {
  margin-top: 2rem;
}

.overlay {
  height: 100vh;
  width: 100vw;
  position: fixed;
  background-color: black;
  opacity: 0.3;
  overflow: hidden;
  margin: 0;
}
const App = () => {
  const [displayModal, setDisplayModal] = React.useState(false);
  const [acceptOffer, setAcceptOffer] = React.useState(false);
  return (
    <div className="App">
      {!displayModal ? (
        acceptOffer ? (
          <span>Offer Accepted </span>
        ) : (
          <button
            className="showOfferButton"
            onClick={() => {
              setDisplayModal(true);
            }}
          >
            {" "}
            Show Offer{" "}
          </button>
        )
      ) : (
        <React.Fragment>
          <div className="overlay"></div>
          <div className="modal">
            <button
              className="xButton"
              onClick={() => {
                setDisplayModal(false);
              }}
            >
              {" "}
              x{" "}
            </button>
            <span className="modalContent">
              Click the button to accept our amazing offer!
            </span>
            <button
              className="acceptButton"
              onClick={() => {
                setAcceptOffer(true);
                setDisplayModal(false);
              }}
            >
              Accept Offer{" "}
            </button>
          </div>
        </React.Fragment>
      )}
    </div>
  );
}


ReactDOM.render(<App />, document.getElementById('app'));
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External CSS

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External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/react/17.0.1/umd/react.production.min.js
  2. https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.1/umd/react-dom.production.min.js