#music {
    position: absolute; 
    cursor: pointer; 
    bottom: 10px; 
    left: 10px; 
    width: 40px; 
    height: 40px; 
    border-radius: 50%; 
    border: 3px solid red;
}

#music.scale-animation {
    animation: scaleAnimation 0.5s infinite; 
}

@keyframes scaleAnimation {
    0% {
      transform: scale(1);
      box-shadow: 0 0 10px rgba(0, 0, 255, 0.7);
    }
    50% {
      transform: scale(1.2);
      box-shadow: 0 0 10px rgba(0, 0, 255, 0.7);
    }
    100% {
      transform: scale(1);
      box-shadow: 0 0 10px rgba(0, 0, 255, 0.7);
    }
}