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HTML 

              
                <div class="container">
	<form class="form-style" action="" method="post">
		<div class="header">
      <div class="example-icon" >ICON</div>
      <small>Neque porro quisquam est qui dolorem ipsum</small>
		</div>
    <hr>
		<div class="content">
        <label for="inp" class="inp">
          <input type="text" id="inp" placeholder="&nbsp;">
          <span class="label">Username</span>
          <span class="border"></span>
        </label>
        <label for="inp" class="inp">
          <input type="password" id="inp" placeholder="&nbsp;">
          <span class="label">Password</span>
          <span class="border"></span>
        </label>
      
		</div>
    <hr>
		<div class="footer">
      <input type="submit" name="submit" value="Login" class="bton login" />
      <input type="submit" name="submit" value="Register" class="bton register" />
		</div>
	</form>
</div>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Roboto&display=swap');

body {
    background: #00c3ff;  /* fallback for old browsers */
  background: -webkit-linear-gradient(to right, #1c1d22, #00c3ff, #6060dc);  /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(to right, #1c1d22, #00c3ff, #6060dc); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
  font-family: 'Roboto', sans-serif;
}

/** Form Style **/
.form-style hr {
  border-color: #383838;
}
.container {
  position: relative;
	width: 450px;
	margin: 70px auto;
  animation: myanim 2.3s;
}
.form-style {
  background: #212121;
  border-radius: 5px;
  padding: 25px;
  box-shadow: 0 2px 8px rgba(0,0,0,.33);
}
.form-style .header{
  color: white;
  text-align: center;
  margin-bottom: 25px;
}

.form-style .header small{
  color: dimgrey;
}
.content {
  text-align: center;
  display: grid;
  margin-bottom: 50px;
}

.example-icon {
  font-size: 2.4rem;
  font-weight: 900;
  color: #00c3ff;
}

.footer {
  padding:20px;
  text-align: center;
}

/** Button Style **/
.bton {
  cursor: pointer;
  padding: 10px 35px;
  background: gray;
  border: 1px solid black;
  border-radius: 5px;
  font-weight: 900;
  color: white;
  transition: all 0.6s;
}

.bton:hover {
  background: #00c3ff;
}
.bton.login {
  background: #6060dc;
}

.bton.register {
  background: #3a3a3a;
}

/** INPUT Style **/
.inp
  position: relative
  margin: auto
  margin-top:25px
  width: 100%
  max-width: 280px
  //transform: rotateX(45deg) rotateY(-10deg) rotate(25deg) scale(2)
  .label
    position: absolute
    top: 16px
    left: 0
    font-size: 16px
    color: #9098A9
    font-weight: 500
    transform-origin: 0 0
    transition: all .2s ease
  .border
    position: absolute
    bottom: 0
    left: 0
    height: 2px
    width: 100%
    background #6060dc
    transform: scaleX(0)
    transform-origin: 0 0
    transition: all .15s ease
  input
    -webkit-appearance: none
    width: 100%
    border: 0
    font-family: inherit
    padding: 0
    height: 48px
    font-size: 16px
    font-weight: 500
    border-bottom: 2px solid #C8CCD4
    background: none
    border-radius: 0
    color: #223254
    transition: all .15s ease
    &:hover
      background: rgba(#223254,.03)
    &:not(:placeholder-shown)
      + span
        color #5A667F
        transform: translateY(-26px) scale(.75)
    &:focus
      background: none
      outline: none
      + span
        color #6060dc
        transform: translateY(-26px) scale(.75)
        + .border
            transform: scaleX(1)
            
@keyframes myanim {
  0%   { 
    opacity: 0;
    top: -35px;
  }
  100% { 
    top: 0px;
    opacity: 1; 
  }
}
!

JS
!
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