Modal.css

.Modal {
  /* fixed position will always show modal in the top left corner */
  position: fixed;
  top: 0;
  left: 0;
  /* z-index to show modal even if it is used before some other elements */
  z-index: 5;
  /* make modal fill whole window */
  width: 100vw;
  height: 100vh;
  /* add some background to blur content behind modal */
  background: rgba(255, 255, 255, 0.9);

  /* center content inside modal */
  display: flex;
  justify-content: center;
  align-items: center;
}