js 鼠标提示

<div class="tooltip-container">
  Hover over me
  <span class="tooltip">This is a custom tooltip</span>
</div>

.tooltip-container {
  position: relative;
  display: inline-block;
}

.tooltip {
  visibility: hidden;
  width: 120px;
  background-color: black;
  color: #fff;
  text-align: center;
  border-radius: 5px;
  padding: 5px 0;
  position: absolute;
  z-index: 1;
  bottom: 125%; /* Position the tooltip above the text */
  left: 50%;
  margin-left: -60px; /* Use half of the width (120/2 = 60), to center the tooltip */
  opacity: 0;
  transition: opacity 0.3s;
}

.tooltip-container:hover .tooltip {
  visibility: visible;
  opacity: 1;
}