#iworks-pwa-add-button-container {
  text-align: center;
}

#iworks-pwa-add-button {
  margin: 1em;
  border: 1px solid rgba(0, 0, 0, 0.7);
  background-color: #fff;
  color: #000;
}
#iworks-pwa-add-button:hover {
  background-color: #ddd;
}