.wp-block-button .wp-block-button__link {
  text-transform: uppercase;
  position: relative;
  z-index: 0;
}
.wp-block-button .wp-block-button__link:after,
.wp-block-button .wp-block-button__link:before {
  display: block;
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  -webkit-transition: all 0.4s;
  -o-transition: all 0.4s;
  transition: all 0.4s;
}
.wp-block-button .wp-block-button__link:after {
  z-index: -1;
  width: 0;
}
.wp-block-button .wp-block-button__link:before {
  z-index: -2;
}
.wp-block-button .wp-block-button__link:focus {
  outline: none;
}
.wp-block-button .wp-block-button__link:after,
.wp-block-button .wp-block-button__link:before {
  display: block;
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  -webkit-transition: all 0.4s;
  -o-transition: all 0.4s;
  transition: all 0.4s;
}
.wp-block-button .wp-block-button__link:after {
  z-index: -1;
  width: 0;
}
.wp-block-button .wp-block-button__link:before {
  z-index: -2;
}
.wp-block-button .wp-block-button__link:focus {
  outline: none;
}
.wp-block-button .wp-block-button__link:before {
  background: #1bb999;
}
.wp-block-button .wp-block-button__link:hover:after {
  background: #18a78a;
  width: 100%;
}