.btn {
  border: 0;
  position: relative;
  z-index: 1;
}
.btn,
.btn:active {
  background-color: #e22278 !important;
  border-color: #e22278 !important;
  color: #ffffff !important;
}
.btn:hover,
.btn:focus,
.btn.focus,
.btn.active {
  color: #e22278 !important;
  background-color: #fff !important;
  border-color: #e22278 !important;
}
.btn.disabled,
.btn:disabled {
  color: #ffffff !important;
  background-color: #e22278 !important;
  border-color: #e22278 !important;
}
.btn:before {
  content: '';
  left: 0;
  top: 0;
  bottom: auto;
  position: absolute;
  width: 100%;
  height: 0%;
  background-color: white;
  z-index: -1;
  transition: all 0.3s;
}

.btn:hover:before {
  height: 100%;
  top: auto;
  bottom: 0;
}