#top-left-button {
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 9999;
  background: #2f8589;
  color: #fff;
  padding: 10px 20px;
  border-radius: 5px;
  text-decoration: none;
  font-family: sans-serif;
  font-size: 16px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
  transition: background 0.2s;
}
#top-left-button:hover {
  background: #1565c0;
}