Google Material Design Input Boxes

html code:

<div class="container">
 
  <h2>Google Material Design in CSS3<small>Inputs</small></h2>
 
  <form>
   
    <div class="group">     
      <input type="text" required>
      <span class="highlight"></span>
      <span class="bar"></span>
      <label>Name</label>
    </div>
     
    <div class="group">     
      <input type="text" required>
      <span class="highlight"></span>
      <span class="bar"></span>
      <label>Email</label>
    </div>
   
  </form>
     
  <p class="footer">
    a <a href="https://scotch.io/tutorials/css/google-material-design-input-boxes-in-css3" target="_blank">tutorial</a> by <a href="https://scotch.io" target="_blank">scotch.io</a>
  </p>
 
</div>

csscode:

* { box-sizing:border-box; }

/* basic stylings ------------------------------------------ */
body                  { background:url(https://scotch.io/wp-content/uploads/2014/07/61.jpg); }
.container         {
  font-family:'Roboto';
  width:600px;
  margin:30px auto 0;
  display:block;
  background:#FFF;
  padding:10px 50px 50px;
}
h2          {
  text-align:center;
  margin-bottom:50px;
}
h2 small {
  font-weight:normal;
  color:#888;
  display:block;
}
.footer     { text-align:center; }
.footer a  { color:#53B2C8; }

/* form starting stylings ------------------------------- */
.group               {
  position:relative;
  margin-bottom:45px;
}
input                 {
  font-size:18px;
  padding:10px 10px 10px 5px;
  display:block;
  width:300px;
  border:none;
  border-bottom:1px solid #757575;
}
input:focus         { outline:none; }

/* LABEL ======================================= */
label                  {
  color:#999;
  font-size:18px;
  font-weight:normal;
  position:absolute;
  pointer-events:none;
  left:5px;
  top:10px;
  transition:0.2s ease all;
  -moz-transition:0.2s ease all;
  -webkit-transition:0.2s ease all;
}

/* active state */
input:focus ~ label, input:valid ~ label         {
  top:-20px;
  font-size:14px;
  color:#5264AE;
}

/* BOTTOM BARS ================================= */
.bar     { position:relative; display:block; width:300px; }
.bar:before, .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;
}
.bar:before {
  left:50%;
}
.bar:after {
  right:50%;
}

/* active state */
input:focus ~ .bar:before, input:focus ~ .bar:after {
  width:50%;
}

/* HIGHLIGHTER ================================== */
.highlight {
  position:absolute;
  height:60%;
  width:100px;
  top:25%;
  left:0;
  pointer-events:none;
  opacity:0.5;
}

/* active state */
input:focus ~ .highlight {
  -webkit-animation:inputHighlighter 0.3s ease;
  -moz-animation:inputHighlighter 0.3s ease;
  animation:inputHighlighter 0.3s ease;
}

/* ANIMATIONS ================ */
@-webkit-keyframes inputHighlighter {
    from { background:#5264AE; }
  to     { width:0; background:transparent; }
}
@-moz-keyframes inputHighlighter {
    from { background:#5264AE; }
  to     { width:0; background:transparent; }
}
@keyframes inputHighlighter {
    from { background:#5264AE; }
  to     { width:0; background:transparent; }
}