#block-chat {
  display: block;
  position: fixed;
  bottom: 1rem;
  background-color: white;
  padding: 0 1rem;
  right: 1rem;
  border: 1px solid lightgray;
  text-align: center;
  max-width: 250px;
  border-radius: 5px;
  -webkit-box-shadow: 3px 3px 6px -3px rgba(153,153,153,0.5);
  box-shadow: 3px 3px 6px -3px rgba(153,153,153,0.5);
  z-index: 100;
}

#block-chat img {
  max-width: 200px;
}

#block-chat h3 {
  text-align: center;
}