// JavaScript code for switching tabs
var current_fs, next_fs, previous_fs; //fieldsets
var left, opacity, scale; //fieldset properties we will animate
var animating; //flag to prevent quick multi-click glitches

$(".next").click(function() {
  if (animating) return false;
  animating = true;

  current_fs = $(this).parent();
  next_fs = $(this).parent().next();

  //activate next step on progressbar using the index of next_fs
  $("#progressbar li").eq($("fieldset").index(next_fs)).addClass("active");

  //show the next fieldset
  next_fs.show();
  //hide the current fieldset with style
  current_fs.animate({
    opacity: 0
  }, {
    step: function(now, mx) {
      //as the opacity of current_fs reduces to 0 - stored in "now"
      //1. scale current_fs down to 80%
      scale = 1 - (1 - now) * 0.2;
      //2. bring next_fs from the right(50%)
      left = (now * 50) + "%";
      //3. increase opacity of next_fs to 1 as it moves in
      opacity = 1 - now;
      current_fs.css({
        'transform': 'scale(' + scale + ')',
        'position': 'absolute'
      });
      next_fs.css({
        'left': left,
        'opacity': opacity
      });
    },
    duration: 800,
    complete: function() {
      current_fs.hide();
      animating = false;
    },
    easing: 'easeInOutBack' // custom easing plugin
  });
});

$(".previous").click(function() {
  if (animating) return false;
  animating = true;

  current_fs = $(this).parent();
  previous_fs = $(this).parent().prev();

  //de-activate current step on progressbar
  $("#progressbar li").eq($("fieldset").index(current_fs)).removeClass("active");

  //show the previous fieldset
  previous_fs.show();
  //hide the current fieldset with style
  current_fs.animate({
    opacity: 0
  }, {
    step: function(now, mx) {
      //as the opacity of current_fs reduces to 0 - stored in "now"
      //1. scale previous_fs from 80% to 100%
      scale = 0.8 + (1 - now) * 0.2;
      //2. take current_fs to the right(50%) - from 0%
      left = ((1 - now) * 50) + "%";
      //3. increase opacity of previous_fs to 1 as it moves in
      opacity = 1 - now;
      current_fs.css({
        'left': left
      });
      previous_fs.css({
        'transform': 'scale(' + scale + ')',
        'opacity': opacity
      });
    },
    duration: 800,
    complete: function() {
      current_fs.hide();
      animating = false;
    },
    easing: 'easeInOutBack' // custom easing plugin
  });
});

$(".submit").click(function() {
  return false;
})

/* Custom Font */

@import url(http://fonts.googleapis.com/css?family=Montserrat);

/* Basic Reset */

* {
  margin: 0;
  padding: 0;
}
html {
  height: 100%;
  /* Image only BG fallback */
  background: url('http://thecodeplayer.com/uploads/media/gs.png');
  /* Background = Gradient + Image Pattern Combo */
  background: linear-gradient(rgba(196, 102, 0, 0.2), rgba(155, 89, 182, 0.2)), url('http://thecodeplayer.com/uploads/media/gs.png');
}
body {
  font-family: montserrat, arial, verdana;
}
/* Form Styles */

#msform {
  width: 400px;
  margin: 50px auto;
  text-align: center;
  position: relative;
}
#msform fieldset {
  background: white;
  border: 0 none;
  border-radius: 3px;
  box-shadow: 0 0 15px 1px rgba(0, 0, 0, 0.4);
  padding: 20px 30px;
  box-sizing: border-box;
  width: 80%;
  margin: 0 10%;
  position: relative;
}
/* Hide all except the first fieldset */

#msform fieldset:not(:first-of-type) {
  display: none;
}
/* Inputs */

#msform input,
#msform textarea {
  padding: 15px;
  border: 1px solid #ccc;
  border-radius: 3px;
  margin-bottom: 10px;
  width: 100%;
  box-sizing: border-box;
  font-family: montserrat;
  color: #2C3E50;
  font-size: 13px;
}
/* Buttons */

#msform .action-button {
  width: 100px;
  background: #27AE60;
  font-weight: bold;
  color: white;
  border: 0 none;
  border-radius: 1px;
  cursor: pointer;
  padding: 10px 5px;
  margin: 10px 5px;
}
#msform .action-button:hover,
#msform .action-button:focus {
  box-shadow: 0 0 0 2px white, 0 0 0 3px #27AE60;
}
/* Headings */

.fs-title {
  font-size: 15px;
  text-transform: uppercase;
  color: #2C3E50;
  margin-bottom: 10px;
}
.fs-subtitle {
  font-weight: normal;
  font-size: 13px;
  color: #666;
  margin-bottom: 20px;
}
/* Progressbar */

#progressbar {
  margin-bottom: 30px;
  overflow: hidden;
  counter-reset: step; /* CSS counters to number the steps */
}
#progressbar li {
  list-style-type: none;
  color: white;
  text-transform: uppercase;
  font-size: 9px;
  width: 33.33%;
  float: left;
  position: relative;
}
#progressbar li:before {
  content: counter(step);
  counter-increment: step;
  width: 20px;
  line-height: 20px;
  display: block;
  font-size: 10px;
  color: #333;
  background: white;
  border-radius: 3px;
  margin: 0 auto 5px auto;
}
/* Progressbar Connectors */

#progressbar li:after {
  content: '';
  width: 100%;
  height: 2px;
  background: white;
  position: absolute;
  left: -50%;
  top: 9px;
  z-index: -1;
}
#progressbar li:first-child:after {
  content: none;
}
/* Marking Active/Completed Steps Green */

#progressbar li.active:before,
#progressbar li.active:after {
  background: #27AE60;
  color: white;
}

<div class="container">
  <div class="row">
    <div class="col-md-12">
      <!-- Multistep Form -->
      <form id="msform">
        <!-- Progressbar -->
        <ul id="progressbar">
          <li class="active">Account Setup</li>
          <li>Social Profiles</li>
          <li>Personal Details</li>
        </ul>
        <!-- Fieldsets -->
        <fieldset>
          <h2 class="fs-title">Create your account</h2>
          <h3 class="fs-subtitle">This is step 1</h3>
          <input type="text" name="email" placeholder="Email" />
          <input type="password" name="pass" placeholder="Password" />
          <input type="password" name="cpass" placeholder="Confirm Password" />
          <input type="button" name="next" class="next action-button" value="Next" />
        </fieldset>
        <fieldset>
          <h2 class="fs-title">Social Profiles</h2>
          <h3 class="fs-subtitle">Your presence on the social network</h3>
          <input type="text" name="twitter" placeholder="Twitter" />
          <input type="text" name="facebook" placeholder="Facebook" />
          <input type="text" name="gplus" placeholder="Google Plus" />
          <input type="button" name="previous" class="previous action-button" value="Previous" />
          <input type="button" name="next" class="next action-button" value="Next" />
        </fieldset>
        <fieldset>
          <h2 class="fs-title">Personal Details</h2>
          <h3 class="fs-subtitle">We will never sell it</h3>
          <input type="text" name="fname" placeholder="First Name" />
          <input type="text" name="lname" placeholder="Last Name" />
          <input type="text" name="phone" placeholder="Phone" />
          <textarea name="address" placeholder="Address"></textarea>
          <input type="button" name="previous" class="previous action-button" value="Previous" />
          <input type="submit" name="submit" class="submit action-button" value="Submit" />
        </fieldset>
      </form>
    </div>
  </div>
</div>