CSS Tooltip Generator

Live preview

Hover the button below to see the tooltip.

.tooltip {
  position: relative;
  display: inline-block;
}
.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 10px;
  background: #1f2937;
  color: #ffffff;
  font-size: 13px;
  line-height: 1.3;
  white-space: nowrap;
  border-radius: 6px;
  opacity: 0;
  transition: opacity 0.2s ease;
  pointer-events: none;
  z-index: 10;
}
.tooltip:hover::after {
  opacity: 1;
}
.tooltip::before {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 6px;
  border-style: solid;
  border-color: #1f2937 transparent transparent transparent;
  opacity: 0;
  transition: opacity 0.2s ease;
  pointer-events: none;
}
.tooltip:hover::before {
  opacity: 1;
}

<span class="tooltip" data-tooltip="Hi there!">Hover me</span>