ツールチップ素材

シンプルなツールチップ（hover）

<span class="tooltip">ホバーしてね<span class="tooltip-text">シンプルなツールチップ</span></span>
.tooltip {
  position: relative;
  display: inline-block;
  cursor: pointer;
}
.tooltip .tooltip-text {
  visibility: hidden;
  opacity: 0;
  width: 120px;
  background: #222;
  color: #fff;
  text-align: center;
  border-radius: 6px;
  padding: 8px 0;
  position: absolute;
  z-index: 1;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%);
  transition: opacity 0.3s;
  font-size: 0.98em;
  pointer-events: none;
}
.tooltip:hover .tooltip-text {
  visibility: visible;
  opacity: 1;
}

バルーン型ツールチップ

<span class="tooltip-balloon">バルーン<span class="tooltip-balloon-text">バルーン型ツールチップ</span></span>
.tooltip-balloon {
  position: relative;
  display: inline-block;
  cursor: pointer;
}
.tooltip-balloon .tooltip-balloon-text {
  visibility: hidden;
  opacity: 0;
  min-width: 120px;
  background: #4f8cff;
  color: #fff;
  text-align: center;
  border-radius: 16px;
  padding: 10px 16px;
  position: absolute;
  z-index: 1;
  bottom: 140%;
  left: 50%;
  transform: translateX(-50%);
  transition: opacity 0.3s;
  font-size: 1em;
  pointer-events: none;
}
.tooltip-balloon .tooltip-balloon-text::after {
  content: '';
  position: absolute;
  top: 100%; left: 50%;
  transform: translateX(-50%);
  border-width: 8px;
  border-style: solid;
  border-color: #4f8cff transparent transparent transparent;
}
.tooltip-balloon:hover .tooltip-balloon-text {
  visibility: visible;
  opacity: 1;
}

フェードインツールチップ

<span class="tooltip-fade">フェード<span class="tooltip-fade-text">フェードインで表示</span></span>
.tooltip-fade {
  position: relative;
  display: inline-block;
  cursor: pointer;
}
.tooltip-fade .tooltip-fade-text {
  visibility: hidden;
  opacity: 0;
  width: 120px;
  background: #ff6ec4;
  color: #fff;
  text-align: center;
  border-radius: 6px;
  padding: 8px 0;
  position: absolute;
  z-index: 1;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%);
  transition: opacity 0.5s;
  font-size: 0.98em;
  pointer-events: none;
}
.tooltip-fade:hover .tooltip-fade-text {
  visibility: visible;
  opacity: 1;
}