解决JS跟随光标元素在CSS动画上消失的问题：z-index应用指南

/* 确保跟随光标的元素具有更高的z-index */
#circle {
  max-width: 10%;
  background-color: transparent;
  position: absolute;
  z-index: 2; /* 设置一个较高的z-index值 */
}

/* 动画元素可以设置一个较低的z-index值，或保持默认 */
#shakingimage {
  max-width: 45%;
  position: relative;
  z-index: 1; /* 设置一个相对较低的z-index值 */
}

/* 其他CSS样式保持不变 */
body {
  background-color: white;
}

h1 {
  color: teal;
  font-family: Arial, Helvetica, sans-serif;
  text-align: center;
}

div {
  background-color: teal;
  padding: 5%;
  text-align: center;
}

#circle:hover {
  cursor: url('***********'), auto;
}

#shakingimage:hover {
  animation: shake 0.5s;
  animation-iteration-count: infinite;
  cursor: url('************'), auto;
}

@keyframes shake {
  0% { transform: translate(1px, 1px) rotate(0deg); }
  10% { transform: translate(-1px, -2px) rotate(-1deg); }
  20% { transform: translate(-3px, 0px) rotate(1deg); }
  30% { transform: translate(3px, 2px) rotate(0deg); }
  40% { transform: translate(1px, -1px) rotate(1deg); }
  50% { transform: translate(-1px, 2px) rotate(-1deg); }
  60% { transform: translate(-3px, 1px) rotate(0deg); }
  70% { transform: translate(3px, 1px) rotate(-1deg); }
  80% { transform: translate(-1px, -1px) rotate(1deg); }
  90% { transform: translate(1px, 2px) rotate(0deg); }
  100% { transform: translate(1px, -2px) rotate(-1deg); }
}

.buttonbox {
  display: inline-flex;
  justify-content: center;
  flex-direction: row;
}

button {
  padding: 15px 25px;
  margin: 5px;
  font-size: 24px;
  text-align: center;
  cursor: pointer;
  outline: solid 2px white;
  color: #ffffff;
  background-color: #008080;
  border: none;
  border-radius: 15px;
  box-shadow: 0 9px #999;
}

button:hover {
  background-color: rgb(0, 172, 172);
}

button:active {
  background-color: #008080;
  box-shadow: 0 5px #666;
  transform: translateY(4px);
}

let circle = document.getElementById('circle');
const onMouseMove = (e) => {
  circle.style.left = e.pageX + 'px';
  circle.style.top = e.pageY + 'px';
};
document.addEventListener('mousemove', onMouseMove);