#hanoi-video-elem {
  margin-top: 2em;
}
#tria-n {
  border-style: solid;
  border-color:  #939ab7;
  background-color: #24273a;
  border-width: 2px;
  color: inherit;

  outline-color:  #8aadf4;
  font-size: 20px;
}