.login100-form-btn {
  font-family: Poppins-Medium;
  font-size: 16px;
  color: #555555;
  line-height: 1.2;

  display: -webkit-box;
  display: -webkit-flex;
  display: -moz-box;
  display: -ms-flexbox;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0 20px;
  min-width: 305px;
  height: 50px;
  border-radius: 25px;

  background: #9152f8;
  background: -webkit-linear-gradient(bottom, #7579ff, #b224ef);
  background: -o-linear-gradient(bottom, #7579ff, #b224ef);
  background: -moz-linear-gradient(bottom, #7579ff, #b224ef);
  background: linear-gradient(bottom, #7579ff, #b224ef);
  position: relative;
  z-index: 1;

  -webkit-transition: all 0.4s;
  -o-transition: all 0.4s;
  -moz-transition: all 0.4s;
  transition: all 0.4s;
}

.login100-form-btn::before {
  content: "";
  display: block;
  position: absolute;
  z-index: -1;
  width: 100%;
  height: 100%;
  border-radius: 25px;
  background-color: #fff;
  top: 0;
  left: 0;
  opacity: 1;

  -webkit-transition: all 0.4s;
  -o-transition: all 0.4s;
  -moz-transition: all 0.4s;
  transition: all 0.4s;
}

.login100-form-btn:hover {
  color: #fff;
}

.login100-form-btn:hover:before {
  opacity: 0;
}