JSFiddle - React, Tailwind, and code Playground

by Dmitry Nazarov

HTML

<a class="btnfos btnfos-2">Hover</a>

CSS

.btnfos {
  color: #19b9c8;
  cursor: pointer;
  display: block;
  font-size: 16px;
  font-weight: 400;
  line-height: 45px;
  max-width: 160px;
  margin: 0 auto 2em;
  position: relative;
  text-transform: uppercase;
  vertical-align: middle;
  width: 100%;
  text-align: center;
}
@media (min-width: 400px) {
  .btnfos {
    display: inline-block;
    margin-right: 2.5em;
  }
  .btnfos:nth-of-type(even) {
    margin-right: 0;
  }
}
@media (min-width: 600px) {
  .btnfos:nth-of-type(even) {
    margin-right: 2.5em;
  }
  .btnfos:nth-of-type(5) {
    margin-right: 0;
  }
}

.btnfos-2 {
  letter-spacing: 2px;
}

.btnfos-2:hover,
.btnfos-2:active {
  letter-spacing: 4px;
}

.btnfos-2:after,
.btnfos-2:before {
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  border: 1px solid rgba(255, 255, 255, 0);
  bottom: 0px;
  content: " ";
  display: block;
  margin: 0 auto;
  position: relative;
  -webkit-transition: all 280ms ease-in-out;
          transition: all 280ms ease-in-out;
  width: 0;
}

.btnfos-2:hover:after,
.btnfos-2:hover:before {
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  border-color: #19b9c8;
  -webkit-transition: width 350ms ease-in-out;
          transition: width 350ms ease-in-out;
  width: 70%;
}

.btnfos-2:hover:before {
  bottom: auto;
  top: 0;
  width: 70%;
}