Creating Tooltips with CSS

Tooltip Technique

Use position: relative on the container.

Create tooltip with ::before or ::after pseudo-element.

Position tooltip with position: absolute.

Show on hover with :hover pseudo-class.

Add arrows using borders and pseudo-elements.

/* Tooltip container */
.tooltip {
  position: relative;
  display: inline-block;
  cursor: help;
}

/* Tooltip text */
.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%);
  background-color: #333;
  color: white;
  padding: 8px 12px;
  border-radius: 4px;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s;
}

/* Show on hover */
.tooltip:hover::after {
  opacity: 1;
  visibility: visible;
}

/* Arrow */
.tooltip::before {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: #333;
  opacity: 0;
  transition: opacity 0.3s;
}

.tooltip:hover::before {
  opacity: 1;
}