/* 下線アニメ
---------------------------------------------------- */
.Text-Span {
  position: relative;
  z-index: 1;
  color: #00b3ee;
}
.Text-Span:after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0%;
  height: 13px;
  background: #fffc00;
  z-index: -1;
  transition: all 0.7s;
}
.Text-Span.isActive:after {
  width: 100%;
}