button {
    margin-top: 20px;
    width: 9em;
    height: 3em;
    border-radius: 30em;
    font-size: 15px;
    font-family: inherit;
    border: none;
    position: relative;
    overflow: hidden;
    z-index: 1;
    box-shadow: 6px 6px 12px blueviolet,
                -6px -6px 12px #ffffff;
   }
   
   button::before {
    content: '';
    width: 0;
    height: 3em;
    border-radius: 50em;
    position: absolute;
    top: 0;
    left: 0;
    background-image: linear-gradient(to right, #2d0fd8 0%, #7647f9 100%);
    transition: .5s ease;
    display: block;
    z-index: -1;
   }
   
button:hover::before {
  width: 9em;
 }
 .wave-group {
  position: relative;
}

.wave-group .input {
  font-size: 16px;
  padding: 10px 10px 10px 5px;
  display: block;
  width: 200px;
  border: none;
  border-bottom: 1px solid #515151;
  background: transparent;
}

.wave-group .input:focus {
  outline: none;
}

.wave-group .label {
  color: #999;
  font-size: 18px;
  font-weight: normal;
  position: absolute;
  pointer-events: none;
  left: 5px;
  top: 10px;
  display: flex;
}

.wave-group .label-char {
  transition: 0.2s ease all;
  transition-delay: calc(var(--index) * .05s);
}

.wave-group .input:focus ~ label .label-char,
.wave-group .input:valid ~ label .label-char {
  transform: translateY(-20px);
  font-size: 14px;
  color: #5264AE;
}

.wave-group .bar {
  position: relative;
  display: block;
  width: 200px;
}

.wave-group .bar:before,.wave-group .bar:after {
  content: '';
  height: 2px;
  width: 0;
  bottom: 1px;
  position: absolute;
  background: #5264AE;
  transition: 0.2s ease all;
  -moz-transition: 0.2s ease all;
  -webkit-transition: 0.2s ease all;
}

.wave-group .bar:before {
  left: 50%;
}

.wave-group .bar:after {
  right: 50%;
}

.wave-group .input:focus ~ .bar:before,
.wave-group .input:focus ~ .bar:after {
  width: 70%;
}