simple tooltip, multiline, pure css

.popover__title {
  cursor: pointer;
}

.popover__wrapper {
  position: relative;
  display: inline-block;
}
.popover__content {
  opacity: 0;
  visibility: hidden;
  position: absolute;
  left: -100px;
  top: 105px;
  right: -100px;
  transform: translate(0,10px);
  background-color: white;
  padding: 15px;
  border: 1px solid #e8e7e7;
  border-radius: 10px;
  box-shadow: 1px 1px 5px rgba(0,0,0,0.16);
  width: auto;
}
.popover__content:before {
  position: absolute;
  z-index: -1;
  content: '';
  right: calc(50% - 10px);
  top: -10px;
  border-style: solid;
  border-width: 0 10px 10px 10px;
  border-color: transparent transparent #e8e7e7 transparent;
  transition-duration: 0.3s;
  transition-property: transform;
}
.popover__wrapper:hover .popover__content {
  z-index: 10;
  opacity: 1;
  visibility: visible;
  transform: translate(0,-20px);
  transition: all 0.5s cubic-bezier(0.75, -0.02, 0.2, 0.97);
}
.popover__message {
  text-align: center;
}

<div class="popover__wrapper">
    <div class="popover__title">
        TITLE
    </div>
    <div class="push popover__content">
        BODY
    </div>
</div>