.zalo-chat-widget,
.messenger-chat-widget {
  right: 20px !important;
}
.zalo-chat-widget {
  bottom: calc(20px + 60px + 10px) !important;
}

.messenger-chat-widget {
  display: block;
  position: fixed;
  bottom: calc(20px + 2 * (60px + 10px)) !important;

  z-index: 99;
  width: 60px;
  height: 60px;
}

.messenger-chat-widget > div {
  cursor: pointer;
}

.messenger-chat-widget img {
  padding: 5px;
}