Tooltip Hover

<div class="tip-wrap">
  <button class="tip-trigger">Hover me</button>
  <div class="tip-box">This is a tooltip</div>
</div>

.tip-wrap {
  position: relative;
  display: inline-block;
}
.tip-trigger {
  padding: 8px 20px;
  background: #fff;
  border: 1px solid #eee;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  color: #1a1a1a;
}
.tip-box {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  padding: 6px 12px;
  background: #1a1a1a;
  color: #fff;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: all .2s cubic-bezier(.16,1,.3,1);
}
.tip-box::after {
  content: '';
  position: absolute;
  top: 100%; left: 50%;
  transform: translateX(-50%);
  border: 4px solid transparent;
  border-top-color: #1a1a1a;
}
.tip-wrap:hover .tip-box {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}