#shimeji {
  position: absolute; 
  top: 50px;           
  left: 50px;
  width: 100px;
  height: auto;
  cursor: grab;
  user-select: none;  
}

#shimeji img {
  width: 100px;          
  pointer-events: none;  
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}