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HTML 

              
                <center class='circle'>
  <div class='back'></div>
  <div class='step-1-container'>
    <h2 class='sign-up'>SIGN UP</h2>
    <label class='teacher'>
      <input type='radio' name='account_type' value='teacher'/>
      Teacher
    </label>
    <label class='student'>
      Student
      <input type='radio' name='account_type' value='student'/>
    </label>
  </div>
  <div class='step-2-container'>
    <i class="fa fa-lock"></i>
    <div class='input-add-on'>
      <input id='#access' type='text' placeholder='ACCESS CODE . . .'/>
      <button class='add-on'>
        ENTER
      </button>
    </div>
  </div>
  <div class='step-3-container'>
    <div>
      <i class='fa fa-edit'></i>
      <input type='text' placeholder='Full Name' />
    </div>
    <div>
      <i class='fa fa-user'></i>
      <input type='text' placeholder='User Name' />
    </div>
    <div>
      <i class='fa fa-lock'></i>
      <input type='password' placeholder='Password' />
    </div>
    <div>
      <i class='fa fa-check-circle-o'></i>
      <input type='password' placeholder='Confirm Password' />
    </div>
    <button type='submit'>CREATE ACCOUNT</button>
  </div>
  <div class='steps'>
    <div class='step-1'>1</div>
    <div class='line-1'></div>
    <div class='step-2'>2</div>
    <div class='line-2'></div>
    <div class='step-3'>3</div>
  </div>
</center>
!

CSS 

              
                @import "nib"

@import url(https://fonts.googleapis.com/css?family=Open\+Sans:400,300,600,700,800)
@import url(http:////netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css)

*
  box-sizing: border-box

body, html
  font-family: "Open Sans"
  color: rgba(white, .5)
  rect(100%)
  background: url(https://i.imgur.com/v6fQNxP.jpg)
  background-size: cover
  
.input-add-on
  position: relative
  display: inline-block
  .add-on
    btn(#FFF)
    padding: 0
    border-radius: 0
    position: absolute
    height: 100%
    width: 30%
    right: 0
    top: 0 
    font-weight: 700
    font-size: 14px
    border: 0
    outline: 0

.back 
  transition: all .5s cubic-bezier(0.425, -0.395, 0.340, 1.420)
  cursor: pointer
  opacity: 0
  circle(50px)
  background: rgba(white, .12)
  box-shadow: inset 0 1px rgba(white, .1), 0 1px 3px rgba(black, .1)
  position: absolute
  top: 50%
  margin-top: -25px
  margin-left: 0px
  z-index: -1
  &:hover
    transition: all .2s cubic-bezier(0.210, -0.510, 0.740, 1.830) !important
    transition-delay: 0 !important
    transform: scale(1.1)
  &:active
    transform: scale(0.9)
  &:after
    content: ''
    display: block
    transform: rotate(45deg)
    absCenter()
    margin-left: 18px
    height: 30%
    width: 30%
    box-shadow: 0px 1px rgba(0, 0, 0, 0.1), inset 1px 0px rgba(0, 0, 0, 0.2)
    border-left: 6px solid rgba(white, .2)
    border-bottom: 6px solid rgba(white, .2)

  
.circle
  transform: translateZ(0px)
  circle(400px)
  absCenter()
  background: rgba(white, .12)
  box-shadow: inset 0 1px rgba(white, .3), 0 1px 5px rgba(black, .3)
  text-shadow: 0 1px rgba(black, .1)
  input[type='text'], input[type='password']
    background: rgba(white, .05)
    box-shadow: inset 0 0 3px rgba(black, .4)
    border: 0
    outline: 0
    font-weight: 200
    font-size: 13px
    color: white

h2
  margin: 80px 0 40px
  font-size: 46px

.step-1-container
  label
    margin: 0 8px
    btn()
    btn-lg()
    input
      display: none  
    &.student
      btn('primary')
      btn-lg()

.step-2-container
  .fa-lock
    display: block
    font-size: 120px
    margin: 50px 0 10px
  input[type='text']
    width: 215px
    padding: 15px 75px 15px 20px

.step-3-container
  > div
    display: inline-block
    position relative
    i
      text-align: left
      width: 25px
      text-shadow: 1px 0 rgba(black, .2)
      position: absolute
      left: 12px
      top: 8px
      border-right: 2px solid rgba(white, .3)
  input
    display: block
    margin: 0 auto
    padding: 0 10px 0 50px;
    height: 30px;
    margin-bottom: 5px;
    &:after
      content: ''
      display: block
      height: 75%
      border-left: 2px solid white
  button
    btn(#FFF)
    width: 215px
    margin-top: 5px
    line-height: 30px
    border-radius: 0
    font-weight: 700
    

.step-2-container, .step-3-container
  opacity: 0
  position: absolute
  top: -10px
  left: 0; right: 0;
  margin: auto
  z-index: -1

dur = .7s

.steps
  size = 44px
  position: absolute;
  bottom: 90px;
  width: 100%;
  font: 700 25px/39px "Open Sans"
  div 
    display: inline-block
    &[class^='line-']
      width: 50px
      border-bottom: 2px solid rgba(white, .2)
      margin-bottom: 8px
      position: relative
      &:after
        transition: width dur
        border-bottom: 2px solid rgba(white, .9)
        content: ' '
        display: block
        width: 0
        position: absolute
    &[class^='step-']
      color: rgba(white, .2)
      circle(size)
      border: 2px solid rgba(white, .2)
      transition: all dur
      &:after
        content: ''
        transition: all dur
        opacity: 0;
        border-left: 6px solid rgba(white, .9)
        border-bottom: 6px solid rgba(white, .9)
        position: absolute
        top: 35%
        left: 27%
        height: 15%
        width: 35%
        box-shadow: -1px 1px rgba(black, .2)
  
.circle-2
  .back
    margin-left: -70px
    opacity: 1
  &.transition .back
    transition-delay: dur
  
.circle-3
  .step-3-container
    position: absolute
    top: 60px
  .add-on
    transition: width 0.4s
    width: 100%

for i in (2..4)
  .circle-{i}
    .step-{(i - 1)}-container
      z-index: -1
      opacity: 0
      transition: all dur
      pointer-events: none
    .step-{i}-container
      transition: opacity dur
      transition-delay: dur - .2
      opacity: 1
    .steps
      .step-{(i - 1)}
        transition: all dur
        border-color: transparent
        background: #85C05F
        box-shadow: -1px 1px rgba(black,.2)
        transform: rotate(310deg)
        color: transparent
        text-shadow: none
        &:after
          opacity: 1
      .line-{(i - 1)}:after
        width: 100%
      .step-{i}
        transition-delay: .5s
        border-color: rgba(white, .9)
        color: rgba(white, .9)
!

JS 

              
                var transEnd = 'transitionend webkitTransitionEnd oTransitionEnd MSTransitionEnd'

$(".step-1-container").bind(transEnd, function(el){ 
  if(el.target == this) {
    this.style.display = 'none';
    $('.circle').removeClass('transition');
  }
});

$(".input-add-on").bind(transEnd, function(el) {
  if(el.target == this)
    $('.step-2-container').css('display', 'none');
});

$('.step-1-container label').click(function() {
  $('.circle').addClass('circle-2 transition');
  $('label').each(function(i, el) {
    if($(el).find('input').prop('checked'))
      $(el).addClass('selected')
    else
      $(el).removeClass('selected')
  });
     
});

$('.add-on').click(function(e) {
  $('.circle').addClass('circle-3');
});

$('.back').click(function() {
  if($('.circle').hasClass('circle-3')) {
    $('.circle').removeClass('circle-3')
    $('.step-2-container').css('display', 'block');
  } else {
    $('.circle').removeClass('circle-2')
    $('.step-1-container').css('display', 'block');
  }                 
});
!
999px

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