在js或css中，有没有办法在悬停时显示低不透明度的工具提示？

<div class="tooltip">
  Hover over me
  <span class="tooltiptext">This is a tooltip</span>
</div>

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

.tooltip .tooltiptext {
  visibility: hidden;
  width: 120px;
  background-color: rgba(0, 0, 0, 0.8);
  color: #fff;
  text-align: center;
  border-radius: 4px;
  padding: 5px;
  position: absolute;
  z-index: 1;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%);
  opacity: 0;
  transition: opacity 0.3s;
}

.tooltip:hover .tooltiptext {
  visibility: visible;
  opacity: 1;
}