<div class="container">
   <section id="formHolder">

      <div class="row">

         <!-- Brand Box -->
         <div class="col-sm-6 brand">
            <a href="#" class="logo">MR <span>.</span></a>

            <div class="heading">
               <h2>Marina</h2>
               <p>Your Right Choice</p>
            </div>

            <div class="success-msg">
               <p>Great! You are one of our members now</p>
               <a href="#" class="profile">Your Profile</a>
            </div>
         </div>


         <!-- Form Box -->
         <div class="col-sm-6 form">

            <!-- Login Form -->
            <div class="login form-peice switched">
               <form class="login-form" action="#" method="post">
                  <div class="form-group">
                     <label for="loginemail">Email Adderss</label>
                     <input type="email" name="loginemail" id="loginemail" required>
                  </div>

                  <div class="form-group">
                     <label for="loginPassword">Password</label>
                     <input type="password" name="loginPassword" id="loginPassword" required>
                  </div>

                  <div class="CTA">
                     <input type="submit" value="Login">
                     <a href="#" class="switch">I'm New</a>
                  </div>
               </form>
            </div><!-- End Login Form -->


            <!-- Signup Form -->
            <div class="signup form-peice">
               <form class="signup-form" action="#" method="post">

                  <div class="form-group">
                     <label for="name">Full Name</label>
                     <input type="text" name="username" id="name" class="name">
                     <span class="error"></span>
                  </div>

                  <div class="form-group">
                     <label for="email">Email Adderss</label>
                     <input type="email" name="emailAdress" id="email" class="email">
                     <span class="error"></span>
                  </div>

                  <div class="form-group">
                     <label for="phone">Phone Number - <small>Optional</small></label>
                     <input type="text" name="phone" id="phone">
                  </div>

                  <div class="form-group">
                     <label for="password">Password</label>
                     <input type="password" name="password" id="password" class="pass">
                     <span class="error"></span>
                  </div>

                  <div class="form-group">
                     <label for="passwordCon">Confirm Password</label>
                     <input type="password" name="passwordCon" id="passwordCon" class="passConfirm">
                     <span class="error"></span>
                  </div>

                  <div class="CTA">
                     <input type="submit" value="Signup Now" id="submit">
                     <a href="#" class="switch">I have an account</a>
                  </div>
               </form>
            </div><!-- End Signup Form -->
         </div>
      </div>

   </section>


   <footer>
      <p>
         Form made by: <a href="http://mohmdhasan.tk" target="_blank">Mohmdhasan.tk</a>
      </p>
   </footer>

</div>
// Fonts
$mainFont: 'Raleway', sans-serif
$subFont: 'Montserrat', sans-serif

// Color Scheme
$primaryColor: #f95959
$secondaryColor: #f7edd5
$inputColor: #bbbbbb



// General Style
body
   font-family: $subFont
   background: $secondaryColor

.container
   max-width: 900px

a
   display: inline-block
   text-decoration: none

input
   outline: none!important

h1
   text-align: center
   text-transform: uppercase
   margin-bottom: 40px
   font-weight: 700

section#formHolder
   padding: 50px 0



// Brand Area
.brand
   padding: 20px
   background: url(https://goo.gl/A0ynht)
   background-size: cover
   background-position: center center
   color: #fff
   min-height: 540px
   position: relative
   box-shadow: 3px 3px 10px rgba(0, 0, 0, 0.3)
   transition: all 0.6s cubic-bezier(1.000, -0.375, 0.285, 0.995)
   z-index: 9999

   &.active
      width: 100%

   &::before
      content: ''
      display: block
      width: 100%
      height: 100%
      position: absolute
      top: 0
      left: 0
      background: rgba(0, 0, 0, 0.85)
      z-index: -1
   a.logo
      color: $primaryColor
      font-size: 20px
      font-weight: 700
      text-decoration: none
      line-height: 1em
      span
         font-size: 30px
         color: #fff
         transform: translateX(-5px)
         display: inline-block

   .heading
      position: absolute
      top: 50%
      left: 50%
      transform: translate(-50%, -50%)
      text-align: center
      transition: all 0.6s
      &.active
         top: 100px
         left: 100px
         transform: translate(0)

      h2
         font-size: 70px
         font-weight: 700
         text-transform: uppercase
         margin-bottom: 0
      p
         font-size: 15px
         font-weight: 300
         text-transform: uppercase
         letter-spacing: 2px
         white-space: 4px
         font-family: $mainFont

   .success-msg
      width: 100%
      text-align: center
      position: absolute
      top: 50%
      left: 50%
      transform: translate(-50%, -50%)
      margin-top: 60px

      p
         font-size: 25px
         font-weight: 400
         font-family: $mainFont

      a
         font-size: 12px
         text-transform: uppercase
         padding: 8px 30px
         background: $primaryColor
         text-decoration: none
         color: #fff
         border-radius: 30px

      p, a
         transition: all 0.9s
         transform: translateY(20px)
         opacity: 0

         &.active
            transform: translateY(0)
            opacity: 1


// Form Area
.form
   position: relative

   .form-peice
      background: #fff
      min-height: 480px
      margin-top: 30px
      box-shadow: 3px 3px 10px rgba(0, 0, 0, 0.2)
      color: $inputColor
      padding: 30px 0 60px
      transition: all 0.9s cubic-bezier(1.000, -0.375, 0.285, 0.995)
      position: absolute
      top: 0
      left: -30%
      width: 130%
      overflow: hidden
      &.switched
         transform: translateX(-100%)
         width: 100%
         left: 0

   form
      padding: 0 40px
      margin: 0
      width: 70%
      position: absolute
      top: 50%
      left: 60%
      transform: translate(-50%, -50%)


      .form-group
         margin-bottom: 5px
         position: relative
         &.hasError
            input
               border-color: $primaryColor !important
            label
               color: $primaryColor !important

      label
         font-size: 12px
         font-weight: 400
         text-transform: uppercase
         font-family: $subFont
         transform: translateY(40px)
         transition: all 0.4s
         cursor: text
         z-index: -1
         &.active
            transform: translateY(10px)
            font-size: 10px
         &.fontSwitch
            font-family: $mainFont !important
            font-weight: 600

      input:not([type=submit])
         background: none
         outline: none
         border: none
         display: block
         padding: 10px 0
         width: 100%
         border-bottom: 1px solid #eee
         color: #444
         font-size: 15px
         font-family: $subFont
         z-index: 1
         &.hasError
            border-color: $primaryColor

      span.error
         color: $primaryColor
         font-family: $subFont
         font-size: 12px
         position: absolute
         bottom: -20px
         right: 0
         display: none

      input[type=password]
         color: $primaryColor

      .CTA
         margin-top: 30px
         input
            font-size: 12px
            text-transform: uppercase
            padding: 5px 30px
            background: $primaryColor
            color: #fff
            border-radius: 30px
            margin-right: 20px
            border: none
            font-family: $subFont

         a.switch
            font-size: 13px
            font-weight: 400
            font-family: $subFont
            color: $inputColor
            text-decoration: underline
            transition: all 0.3s
            &:hover
               color: $primaryColor


footer
   text-align: center
   p
      color: #777
      a, a:focus
         color: #b8b09f
         transition: all .3s
         text-decoration: none !important
         &:hover
            color: $primaryColor



@media (max-width: 768px)
   .container
      overflow: hidden
   section#formHolder
      padding: 0
      div.brand
         min-height: 200px !important
         &.active
            min-height: 100vh !important

         .heading.active
            top: 200px
            left: 50%
            transform: translate(-50%, -50%)

         .success-msg
            p
               font-size: 16px
            a
               padding: 5px 30px
               font-size: 10px


      .form
         width: 80vw
         min-height: 500px
         margin-left: 10vw
         .form-peice
            margin: 0
            top: 0
            left: 0
            width: 100% !important
            transition: all .5s ease-in-out

            &.switched
               transform: translateY(-100%)
               width: 100%
               left: 0
            > form
               width: 100% !important
               padding: 60px
               left: 50%

@media (max-width: 480px)
   section#formHolder .form
      width: 100vw
      margin-left: 0

   h2
      font-size: 50px !important
View Compiled
/*global $, document, window, setTimeout, navigator, console, location*/
$(document).ready(function () {

    'use strict';

    var usernameError = true,
        emailError    = true,
        passwordError = true,
        passConfirm   = true;

    // Detect browser for css purpose
    if (navigator.userAgent.toLowerCase().indexOf('firefox') > -1) {
        $('.form form label').addClass('fontSwitch');
    }

    // Label effect
    $('input').focus(function () {

        $(this).siblings('label').addClass('active');
    });

    // Form validation
    $('input').blur(function () {

        // User Name
        if ($(this).hasClass('name')) {
            if ($(this).val().length === 0) {
                $(this).siblings('span.error').text('Please type your full name').fadeIn().parent('.form-group').addClass('hasError');
                usernameError = true;
            } else if ($(this).val().length > 1 && $(this).val().length <= 6) {
                $(this).siblings('span.error').text('Please type at least 6 characters').fadeIn().parent('.form-group').addClass('hasError');
                usernameError = true;
            } else {
                $(this).siblings('.error').text('').fadeOut().parent('.form-group').removeClass('hasError');
                usernameError = false;
            }
        }
        // Email
        if ($(this).hasClass('email')) {
            if ($(this).val().length == '') {
                $(this).siblings('span.error').text('Please type your email address').fadeIn().parent('.form-group').addClass('hasError');
                emailError = true;
            } else {
                $(this).siblings('.error').text('').fadeOut().parent('.form-group').removeClass('hasError');
                emailError = false;
            }
        }

        // PassWord
        if ($(this).hasClass('pass')) {
            if ($(this).val().length < 8) {
                $(this).siblings('span.error').text('Please type at least 8 charcters').fadeIn().parent('.form-group').addClass('hasError');
                passwordError = true;
            } else {
                $(this).siblings('.error').text('').fadeOut().parent('.form-group').removeClass('hasError');
                passwordError = false;
            }
        }

        // PassWord confirmation
        if ($('.pass').val() !== $('.passConfirm').val()) {
            $('.passConfirm').siblings('.error').text('Passwords don\'t match').fadeIn().parent('.form-group').addClass('hasError');
            passConfirm = false;
        } else {
            $('.passConfirm').siblings('.error').text('').fadeOut().parent('.form-group').removeClass('hasError');
            passConfirm = false;
        }

        // label effect
        if ($(this).val().length > 0) {
            $(this).siblings('label').addClass('active');
        } else {
            $(this).siblings('label').removeClass('active');
        }
    });


    // form switch
    $('a.switch').click(function (e) {
        $(this).toggleClass('active');
        e.preventDefault();

        if ($('a.switch').hasClass('active')) {
            $(this).parents('.form-peice').addClass('switched').siblings('.form-peice').removeClass('switched');
        } else {
            $(this).parents('.form-peice').removeClass('switched').siblings('.form-peice').addClass('switched');
        }
    });


    // Form submit
    $('form.signup-form').submit(function (event) {
        event.preventDefault();

        if (usernameError == true || emailError == true || passwordError == true || passConfirm == true) {
            $('.name, .email, .pass, .passConfirm').blur();
        } else {
            $('.signup, .login').addClass('switched');

            setTimeout(function () { $('.signup, .login').hide(); }, 700);
            setTimeout(function () { $('.brand').addClass('active'); }, 300);
            setTimeout(function () { $('.heading').addClass('active'); }, 600);
            setTimeout(function () { $('.success-msg p').addClass('active'); }, 900);
            setTimeout(function () { $('.success-msg a').addClass('active'); }, 1050);
            setTimeout(function () { $('.form').hide(); }, 700);
        }
    });

    // Reload page
    $('a.profile').on('click', function () {
        location.reload(true);
    });


});

External CSS

  1. https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js
  2. https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js