hubl/src/scss/_chat.scss

sib-chat {
  position:       absolute;
  top:            $menu-height;
  bottom:         0px;
  left:           0px;
  right:          0px;
  margin:         auto;
  display:        none;
}

.chat-view {
  sib-chat {
    display:  block;
    top:      $menu-height + 30px;
  }
}