CodePen Embed - jedBGZ

<span>TAB1</span>
<span>TAB1</span>

span {
  font-size: 24px;
  border-bottom: 2px solid rgba(255, 0, 0, .0);
}
span:hover {
    border-bottom: 2px solid rgba(255, 0, 0, 1);
   -webkit-transition: all;
  -webkit-transition-duration: 600ms;
}

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