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About the <head>

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HTML 

              
                <!DOCTYPE html>
<html>
<head>
	<title>Login & Registration Form</title>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" type="text/css" href="style.css">
  <link href="https://fonts.googleapis.com/css?family=Nunito:400,600,700,800&display=swap" rel="stylesheet">
</head>
<body>
  <div class="cont">
    <div class="form sign-in">
      <h2>Sign In</h2>
      <label>
        <span>Email Address</span>
        <input type="email" name="email">
      </label>
      <label>
        <span>Password</span>
        <input type="password" name="password">
      </label>
      <button class="submit" type="button">Sign In</button>
     

      <div class="social-media">
        <ul>
          <li><img src="images/facebook.png"></li>
          <li><img src="images/twitter.png"></li>
          <li><img src="images/linkedin.png"></li>
          <li><img src="images/instagram.png"></li>
        </ul>
      </div>
    </div>

    <div class="sub-cont">
      <div class="img">
        <div class="img-text m-up">
          <h1>New here?</h1>
          <p>sign up and discover</p>
        </div>
        <div class="img-text m-in">
          <h1>One of us?</h1>
          <p>just sign in</p>
        </div>
        <div class="img-btn">
          <span class="m-up">Sign Up</span>
          <span class="m-in">Sign In</span>
        </div>
      </div>
      <div class="form sign-up">
        <h2>Sign Up</h2>
        <label>
          <span>Name</span>
          <input type="text">
        </label>
        <label>
          <span>Email</span>
          <input type="email">
        </label>
        <label>
          <span>Password</span>
          <input type="password">
        </label>
        <label>
          <span>Confirm Password</span>
          <input type="password">
        </label>
        <button type="button" class="submit">Sign Up Now</button>
      </div>
    </div>
  </div>
<script type="text/javascript" src="script.js"></script>
</body>
</html>
!

CSS 

              
                *, *:before, *:after{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Nunito', sans-serif;
}

body{
  width: 100%;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: 'Nunito', sans-serif;
  border-radius: 50%;
}

input, button{
  border:none;
  background: none;
}

.cont{
  overflow: hidden;
  position: relative;
  width: 900px;
  height: 550px;
  background:#c9def0;
  box-shadow: 0 19px 38px rgba(0, 0, 0, 0.30), 0 15px 12px rgba(0, 0, 0, 0.22);
    border-radius: 15px;
}

.form{
  position: relative;
  width: 640px;
  height: 100%;
  padding: 50px 30px;
  -webkit-transition:-webkit-transform 1.2s ease-in-out;
  transition: -webkit-transform 1.2s ease-in-out;
  transition: transform 1.2s ease-in-out;
  transition: transform 1.2s ease-in-out, -webkit-transform 1.2s ease-in-out;
}

h2{
  width: 100%;
  font-size: 30px;
  text-align: center;
}

label{
  display: block;
  width: 260px;
  margin: 25px auto 0;
  text-align: center;
}

label span{
  font-size: 14px;
  font-weight: 600;
  color: #505f75;
  text-transform: uppercase;
}

input{
  display: block;
  width: 100%;
  margin-top: 5px;
  font-size: 16px;
  padding-bottom: 5px;
  border-bottom: 1px solid rgba(109, 93, 93, 0.4);
  text-align: center;
  font-family: 'Nunito', sans-serif; 
}

button{
  display: block;
  margin: 0 auto;
  width: 260px;
  height: 36px;
  border-radius: 30px;
  color: #fff;
  font-size: 15px;
  cursor: pointer;
}

.submit{
  margin-top: 40px;
  margin-bottom: 30px;
  text-transform: uppercase;
  font-weight: 600;
  font-family: 'Nunito', sans-serif;
  background: rgb(131, 128, 128);
  transition: .5s;
}

.submit:hover{
  transition: .5s;
  background: #000;
}

.forgot-pass{
  margin-top: 15px;
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  color: #0c0101;
  cursor: pointer;
}

.forgot-pass:hover{
  color: red;
}

.social-media{
  width: 100%;
  text-align: center;
  margin-top: 20px;
}

.social-media ul{
  list-style: none;
}

.social-media ul li{
  display: inline-block;
  cursor: pointer;
  margin: 25px 10px;
}

.social-media img{
  width: 20px;
  height: 20px;
}

.sub-cont{
  overflow: hidden;
  position: absolute;
  left: 640px;
  top: 0;
  width: 900px;
  height: 100%;
  padding-left: 260px;
  background: #fff;
  -webkit-transition: -webkit-transform 1.2s ease-in-out;
  transition: -webkit-transform 1.2s ease-in-out;
  transition: transform 1.2s ease-in-out;
}

.cont.s-signup .sub-cont{
  -webkit-transform:translate3d(-640px, 0, 0);
          transform:translate3d(-640px, 0, 0);
}

.img{
  overflow: hidden;
  z-index: 2;
  position: absolute;
  left: 0;
  top: 0;
  width: 260px;
  height: 100%;
  padding-top: 360px;
}

.img:before{
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  width: 900px;
  height: 100%;
  background-image: url(images/bg.jpg);
  background-size: cover;
  transition: -webkit-transform 1.2s ease-in-out;
  transition: transform 1.2s ease-in-out, -webkit-transform 1.2s ease-in-out;
}

.img:after{
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.3);
}

.cont.s-signup .img:before{
  -webkit-transform:translate3d(640px, 0, 0);
          transform:translate3d(640px, 0, 0);
}

.img-text{
  z-index: 2;
  position: absolute;
  left: 0;
  top: 50px;
  width: 100%;
  padding: 0 20px;
  text-align: center;
  color: #fff;
  -webkit-transition:-webkit-transform 1.2s ease-in-out;
  transition: -webkit-transform 1.2s ease-in-out;
  transition: transform 1.2s ease-in-out, -webkit-transform 1.2s ease-in-out;
}

.img-text h2{
  margin-bottom: 10px;
  font-weight: normal;
}

.img-text p{
  font-size: 14px;
  line-height: 1.5;
}

.cont.s-signup .img-text.m-up{
  -webkit-transform:translateX(520px);
          transform:translateX(520px);
}

.img-text.m-in{
  -webkit-transform:translateX(-520px);
          transform:translateX(-520px);
}

.cont.s-signup .img-text.m-in{
  -webkit-transform:translateX(0);
          transform:translateX(0);
}


.sign-in{
  padding-top: 65px;
  -webkit-transition-timing-function:ease-out;
          transition-timing-function:ease-out;
}

.cont.s-signup .sign-in{
  -webkit-transition-timing-function:ease-in-out;
          transition-timing-function:ease-in-out;
  -webkit-transition-duration:1.2s;
          transition-duration:1.2s; 
  -webkit-transform:translate3d(640px, 0, 0);
          transform:translate3d(640px, 0, 0);
}

.img-btn{
  overflow: hidden;
  z-index: 2;
  position: relative;
  width: 100px;
  height: 36px;
  margin: 0 auto;
  background: transparent;
  color: #fff;
  text-transform: uppercase;
  font-size: 15px;
  cursor: pointer;
}

.img-btn:after{
  content: '';
  z-index: 2;
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  border: 2px solid #fff;
  border-radius: 30px;
}

.img-btn span{
  position: absolute;
  left: 0;
  top: 0;
  display: -webkit-box;
  display: flex;
  -webkit-box-pack:center;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  -webkit-transition:-webkit-transform 1.2s;
  transition: -webkit-transform 1.2s;
  transition: transform 1.2s;
  transition: transform 1.2s, -webkit-transform 1.2s;;
}

.img-btn span.m-in{
  -webkit-transform:translateY(-72px);
          transform:translateY(-72px);
}

.cont.s-signup .img-btn span.m-in{
  -webkit-transform:translateY(0);
          transform:translateY(0);
}

.cont.s-signup .img-btn span.m-up{
  -webkit-transform:translateY(72px);
          transform:translateY(72px);
}

.sign-up{
  -webkit-transform:translate3d(-900px, 0, 0);
          transform:translate3d(-900px, 0, 0);
}

.cont.s-signup .sign-up{
  -webkit-transform:translate3d(0, 0, 0);
          transform:translate3d(0, 0, 0);
}
!

JS 

              
                document.querySelector('.img-btn').addEventListener('click', function()
	{
		document.querySelector('.cont').classList.toggle('s-signup')
	}
);
!
999px

Console