Tooltip

tooltip.html

<div class="tooltip">
  <button class="tooltip__btn" type="button" aria-label="Подробности"></button>
  <div class="tooltip__text">
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Accusantium, deserunt, distinctio dolorum eaque eius eveniet ipsam mollitia nostrum pariatur quibusdam quisquam quo quod reprehenderit velit voluptas? Magnam sequi totam voluptate!
  </div>
</div>

tooltip.js

// tooltip

let tooltip = document.querySelectorAll('.tooltip');
let tooltipBtn = document.querySelectorAll('.tooltip__btn');

tooltipBtn.forEach(btn => btn.addEventListener('click', (e) => {
  tooltip.forEach(tooltip => tooltip.classList.remove('tooltip--open'));
  e.target.parentElement.classList.toggle('tooltip--open');
}))

// закроем по клику мимо
document.addEventListener('mouseup', function (evt) {
  if (evt.target.closest('.tooltip') === null) {
    tooltip.forEach(tooltip => tooltip.classList.remove('tooltip--open'));
  }
});

// end tooltip

tooltip.scss

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

.tooltip--open {
  .tooltip__text {
    position: absolute;
    top: calc(100% + 12px);
    left: 50%;
    transform: translateX(-50%);
    display: block;
    width: max-content;
    max-width: 250px;
    padding: 12px;
    border-radius: 12px;
    font-size: 12px;
    box-shadow: 0 0 16px 0 #C1CDDF;
    background: white;
    z-index: 2;
  }
}

.tooltip__btn {
  @extend .btn;
  @extend .btn--only-icon;
  @extend .btn--question;
}

.tooltip__text {
  display: none;
}

///////
.btn {
  display: inline-block;
  padding: 0.6em 1em;
  border: none;
  border-radius: 4px;
  font-size: 18px;
  font-family: inherit;
  font-weight: inherit;
  line-height: normal;
  text-decoration: none;
  text-align: center;
  cursor: pointer;
  
  &:focus {
    outline: none;
    opacity: 0.8;
  }
}

.btn--only-icon {
  padding: 0;
  background-color: transparent;
  border-color: transparent;
}

.btn--question {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 1em;
  height: 1em;
  border: 1.5px solid #dbdbdb;
  border-radius: 50%;
  color: #dbdbdb;

  &::before {
    content: "?";
    font-size: 0.6em;
  }
}