html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;  
}

.form__group {
  position: relative;
  padding: 15px 0 0;
  margin-top: 10px;
  width: 50%;
}

.form__field {
  font-family: inherit;
  width: 100%;
  border: 0;
  border-bottom: 2px solid #9b9b9b;
  outline: 0;
  font-size: 1.3rem;
  color: #fff;
  padding: 7px 0;
  background: transparent;
  transition: border-color 0.2s;
}
.form__field::placeholder {
  color: transparent;
}
.form__field:placeholder-shown ~ .form__label {
  font-size: 1.3rem;
  cursor: text;
  top: 20px;
}

.form__label {
  position: absolute;
  top: 0;
  display: block;
  transition: 0.2s;
  font-size: 1rem;
  color: #9b9b9b;
}
/*
.form__field:focus {
  padding-bottom: 6px;
  font-weight: 700;
  border-width: 3px;
  border-image: linear-gradient(to right, #ffffff, #222222);
  border-image-slice: 1;
}*/
.form__field:focus ~ .form__label {
  position: absolute;
  top: 0;
  display: block;
  transition: 0.2s;
  font-size: 1rem;
  color: #ffffff;
  font-weight: 700;
}

/* reset input */
.form__field:required, .form__field:invalid {
  box-shadow: none;
}

/* demo */
body {
  font-family: "Poppins", sans-serif;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  font-size: 1.5rem;
  background-color: #222222;
}

button{
  background:#ffffff;
  color:#000000;
  border:none;
  position:relative;
  height:60px;
  font-size:1.6em;
  padding:0 2em;
  cursor:pointer;
  transition:800ms ease all;
  outline:none;
}
button:hover{
  background:#222;
  color:#ffffff;
}
button:before,button:after{
  content:'';
  position:absolute;
  top:0;
  right:0;
  height:2px;
  width:0;
  background: #ffffff;
  transition:400ms ease all;
}
button:after{
  right:inherit;
  top:inherit;
  left:0;
  bottom:0;
}
button:hover:before,button:hover:after{
  width:100%;
  transition:800ms ease all;
}
.unsub_text {
  position: absolute;
  color:white;
}
.unsub_link {
  text-decoration:none;
  color:white;
}