HTML

<html lang="en" >
<head>
  <meta charset="UTF-8">

  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css">
<link rel='stylesheet' href='https://fonts.googleapis.com/css?family=Roboto:400,100,300,500,700,900|RobotoDraft:400,100,300,500,700,900'>
<link rel='stylesheet' href='https://maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css'>
<link rel="stylesheet" href="style.css">
 
</head>
<body>
 
<div class="container">
  <div class="card">
    <h1 class="title">Login</h1>
    <form>
      <div class="input-container">
        <input type="text" id="usern" required="required"/>
        <label for="usern">Username</label>
        <div class="bar"></div>
      </div>
      <div class="input-container">
        <input type="text" id="passw" required="required"/>
        <label for="passw">Password</label>
        <div class="bar"></div>
      </div>
      <div class="button-container">
        <button><span>Go</span></button>
      </div>
      <div class="footer"><a href="#">Forgot your password?</a></div>
    </form>
  </div>
  <div class="card alt">
    <div class="toggle"></div>
    <h1 class="title">Register
      <div class="close"></div>
    </h1>
    <form>
      <div class="input-container">
        <input type="text" id="usernR" required="required"/>
        <label for="usernR">Username</label>
        <div class="bar"></div>
      </div>
      <div class="input-container">
        <input type="text" id="passwR" required="required"/>
        <label for="passwR">Password</label>
        <div class="bar"></div>
      </div>
      <div class="input-container">
        <input type="text" id="repeatpass" required="required"/>
        <label for="repeatpass">Repeat Password</label>
        <div class="bar"></div>
      </div>
      <div class="button-container">
        <button><span>Next</span></button>
      </div>
    </form>
  </div>
</div>
 
  <script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script>
  <script  src="function.js"></script>
 
</body>
</html>

CSS

body {
  background: #e9e9e9;
  color: #666666;
  font-family: 'RobotoDraft', 'Roboto', sans-serif;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
.container {
  position: relative;
  max-width: 460px;
  width: 100%;
  margin: 0 auto 100px;
  margin-top: 10%;
 
}
.container.active .card:first-child {
  background: #f2f2f2;
  margin: 0 15px;
}
.container.active .card.alt {
  top: 20px;
  right: 0;
  width: 100%;
  min-width: 100%;
  height: auto;
  border-radius: 5px;
  padding: 60px 0 40px;
  overflow: hidden;
}
.container.active .card.alt .toggle {
  position: absolute;
  top: 40px;
  right: -70px;
  box-shadow: none;
  -webkit-transform: scale(10);
  transform: scale(10);
  transition: -webkit-transform .3s ease;
  transition: transform .3s ease;
  transition: transform .3s ease, -webkit-transform .3s ease;
}
.container.active .card.alt .toggle:before {
  content: '';
}
.container.active .card.alt .title,
.container.active .card.alt .input-container,
.container.active .card.alt .button-container {
  left: 0;
  opacity: 1;
  visibility: visible;
  transition: .3s ease;
}
.container.active .card.alt .title {
  transition-delay: .3s;
}
.container.active .card.alt .input-container {
  transition-delay: .4s;
}
.container.active .card.alt .input-container:nth-child(2) {
  transition-delay: .5s;
}
.container.active .card.alt .input-container:nth-child(3) {
  transition-delay: .6s;
}
.container.active .card.alt .button-container {
  transition-delay: .7s;
}
 
.card {
  position: relative;
  background: #ffffff;
  border-radius: 5px;
  padding: 60px 0 40px 0;
  box-sizing: border-box;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
  transition: .3s ease;
}
 
.card .title {
  position: relative;
  z-index: 1;
  border-left: 5px solid #ff4444;
  margin: 0 0 35px;
  padding: 10px 0 10px 50px;
  color: #ff4444;
  font-size: 32px;
  font-weight: 600;
  text-transform: uppercase;
}
.card .input-container {
  position: relative;
  margin: 0 60px 50px;
}
.card .input-container input {
  outline: none;
  z-index: 1;
  position: relative;
  background: none;
  width: 100%;
  height: 60px;
  border: 0;
  color: #212121;
  font-size: 24px;
  font-weight: 400;
}
.card .input-container input:focus ~ label {
  color: #9d9d9d;
  -webkit-transform: translate(-12%, -50%) scale(0.75);
          transform: translate(-12%, -50%) scale(0.75);
}
.card .input-container input:focus ~ .bar:before, .card .input-container input:focus ~ .bar:after {
  width: 50%;
}
.card .input-container input:valid ~ label {
  color: #9d9d9d;
  -webkit-transform: translate(-12%, -50%) scale(0.75);
          transform: translate(-12%, -50%) scale(0.75);
}
.card .input-container label {
  position: absolute;
  top: 0;
  left: 0;
  color: #757575;
  font-size: 24px;
  font-weight: 300;
  line-height: 60px;
  transition: 0.2s ease;
}
.card .input-container .bar {
  position: absolute;
  left: 0;
  bottom: 0;
  background: #757575;
  width: 100%;
  height: 1px;
}
.card .input-container .bar:before, .card .input-container .bar:after {
  content: '';
  position: absolute;
  background: #ff4444;
  width: 0;
  height: 2px;
  transition: .2s ease;
}
.card .input-container .bar:before {
  left: 50%;
}
.card .input-container .bar:after {
  right: 50%;
}
.card .button-container {
  margin: 0 60px;
  text-align: center;
}
.card .button-container button {
  outline: 0;
  cursor: pointer;
  position: relative;
  display: inline-block;
  background: 0;
  width: 240px;
  border: 2px solid #e3e3e3;
  padding: 20px 0;
  font-size: 24px;
  font-weight: 600;
  line-height: 1;
  text-transform: uppercase;
  overflow: hidden;
  transition: .3s ease;
}
.card .button-container button span {
  position: relative;
  z-index: 1;
  color: #ddd;
  transition: .3s ease;
}
.card .button-container button:before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  display: block;
  background: #ff4444;
  width: 30px;
  height: 30px;
  border-radius: 100%;
  margin: -15px 0 0 -15px;
  opacity: 0;
  transition: .3s ease;
}
.card .button-container button:hover, .card .button-container button:active, .card .button-container button:focus {
  border-color: #ff4444;
}
.card .button-container button:hover span, .card .button-container button:active span, .card .button-container button:focus span {
  color: #ff4444;
}
.card .button-container button:active span, .card .button-container button:focus span {
  color: #ffffff;
}
.card .button-container button:active:before, .card .button-container button:focus:before {
  opacity: 1;
  -webkit-transform: scale(10);
  transform: scale(10);
}
.card .footer {
  margin: 40px 0 0;
  color: #d3d3d3;
  font-size: 24px;
  font-weight: 300;
  text-align: center;
}
.card .footer a {
  color: inherit;
  text-decoration: none;
  transition: .3s ease;
}
.card .footer a:hover {
  color: #bababa;
}
.card.alt {
  position: absolute;
  top: 40px;
  right: -70px;
  z-index: 10;
  width: 140px;
  height: 140px;
  background: none;
  border-radius: 100%;
  box-shadow: none;
  padding: 0;
  transition: .3s ease;
}
.card.alt .toggle {
  position: relative;
  background: #ff4444;
  width: 140px;
  height: 140px;
  border-radius: 100%;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
  color: #ffffff;
  font-size: 58px;
  line-height: 140px;
  text-align: center;
  cursor: pointer;
}
.card.alt .toggle:before {
  content: 'f040';
  display: inline-block;
  font: normal normal normal 14px/1 FontAwesome;
  font-size: inherit;
  text-rendering: auto;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-transform: translate(0, 0);
          transform: translate(0, 0);
}
.card.alt .title,
.card.alt .input-container,
.card.alt .button-container {
  left: 100px;
  opacity: 0;
  visibility: hidden;
}
.card.alt .title {
  position: relative;
  border-color: #ffffff;
  color: #ffffff;
}
.card.alt .title .close {
  cursor: pointer;
  position: absolute;
  top: 0;
  right: 60px;
  display: inline;
  color: #ffffff;
  font-size: 58px;
  font-weight: 400;
}
.card.alt .title .close:before {
  content: '0d7';
}
.card.alt .input-container input {
  color: #ffffff;
}
.card.alt .input-container input:focus ~ label {
  color: #ffffff;
}
.card.alt .input-container input:focus ~ .bar:before, .card.alt .input-container input:focus ~ .bar:after {
  background: #ffffff;
}
.card.alt .input-container input:valid ~ label {
  color: #ffffff;
}
.card.alt .input-container label {
  color: rgba(255, 255, 255, 0.8);
}
.card.alt .input-container .bar {
  background: rgba(255, 255, 255, 0.8);
}
.card.alt .button-container button {
  width: 100%;
  background: #ffffff;
  border-color: #ffffff;
}
.card.alt .button-container button span {
  color: #ff4444;
}
.card.alt .button-container button:hover {
  background: rgba(255, 255, 255, 0.9);
}
.card.alt .button-container button:active:before, .card.alt .button-container button:focus:before {
  display: none;
}
@media (max-width: 750px) {
  .card.alt .toggle {
    width: 50px;
    height: 50px;
    line-height: 50px;
    font-size: 25px;
  }
  .container.active .card.alt .toggle {
   transform: scale(27);
  }
  .container.active .card.alt{
   left: 0;
  }
}

JS

$('.toggle').on('click', function() {
  $('.container').stop().addClass('active');
});
 
$('.close').on('click', function() {
  $('.container').stop().removeClass('active');
});

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