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

.tooltip-container {
  position: relative;
  display: inline-block;
  cursor: pointer;
  font-family: sans-serif;
  padding: 10px 20px;
  background: #e2e8f0;
  border-radius: 8px;
}

.tooltip {
  visibility: hidden;
  width: 120px;
  background-color: #1e293b;
  color: #ffffff;
  text-align: center;
  border-radius: 6px;
  padding: 8px;
  position: absolute;
  z-index: 1;
  opacity: 0;
  transition: opacity 0.3s;
  bottom: 125%; left: 50%; transform: translateX(-50%);
}

.tooltip::after {
  content: "";
  position: absolute;
  top: 100%; left: 50%; margin-left: -5px; border-width: 5px; border-style: solid; border-color: #1e293b transparent transparent transparent;
}

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