.sidebar-button {
  position: fixed;
  left: 0;
  top: 50%;
  background-color: #4CAF50;
  color: #fff;
  border: none;
  padding: 15px;
  border-radius: 5px 0 0 5px;
  cursor: pointer;
  font-size: 16px;
  transform: translateY(-50%) rotate(-90deg);
  margin-left: -40px;
}

.sidebar-button {
}