@-webkit-keyframes f {
  0% {
    opacity: 0;
    -webkit-transform: rotate(45deg) translateY(300%);
    transform: rotate(45deg) translateY(300%);
  }
  50% {
    opacity: 1;
  }
  to {
    opacity: 0;
    -webkit-transform: rotate(45deg) translateY(-300%);
    transform: rotate(45deg) translateY(-300%);
  }
}

@keyframes f {
  0% {
    opacity: 0;
    -webkit-transform: rotate(45deg) translateY(300%);
    transform: rotate(45deg) translateY(300%);
  }
  50% {
    opacity: 1;
  }
  to {
    opacity: 0;
    -webkit-transform: rotate(45deg) translateY(-300%);
    transform: rotate(45deg) translateY(-300%);
  }
}
.vdm_btn_cls {
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-align: center;
  background-color: #343434;
  color: #fff;
  display: inline-block;
  padding: 1.5rem 1rem;
  text-decoration: none;
  -webkit-transition: background-color 0.2s ease-out;
  transition: background-color 0.2s ease-out;
  font-weight: 400;
  -webkit-transition: background-color 0.6s ease-out;
  transition: background-color 0.6s ease-out;
  outline: none;
  position: relative;
  max-width: 23rem;
  min-width: 21.5rem;
  word-break: break-word;
  overflow: hidden;
}
.vdm_btn_cls:active,
.vdm_btn_cls:focus,
.vdm_btn_cls:hover {
  background-color: #525252;
}
.vdm_btn_cls:after {
  background: hsla(0, 0%, 100%, 0.15);
  content: "";
  height: 100%;
  left: 0;
  opacity: 0;
  position: absolute;
  top: 0;
  width: 100%;
}
.vdm_btn_cls:hover:after {
  -webkit-animation: f 0.6s linear forwards;
  animation: f 0.6s linear forwards;
}