.wpbingo-about--background .wpbingo-sub-btn a {
  position: relative;
  display: inline-block;
  z-index: 1;
  border: 0;
  text-transform: revert;
}
.wpbingo-about--background .wpbingo-sub-btn a:before {
  position: absolute;
  right: 0;
  content: "";
  height: 100%;
  width: 0;
  top: 0;
  z-index: -1;
}
.wpbingo-about--background .wpbingo-sub-btn a:hover:before {
  width: 100%;
}