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CSS

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HTML 

              
                <link href='https://fonts.googleapis.com/css?family=Lato:300,400,900' rel='stylesheet' type='text/css'>

<link href="https://s3-us-west-2.amazonaws.com/s.cdpn.io/78060/animate.min.css" rel="stylesheet" type="text/css">

<div class="donate">
<button>Donate</button>
<form name="donAmount" id="donAmount">
  <input type="radio" value="3" name="amount" id="three">
  <label for="three">$3</label>
  <input type="radio" value="25" name="amount" id="twentyfive">
  <label for="twentyfive">$25</label>
  <input type="radio" value="100" name="amount" id="hundred">
  <label for="hundred">$100</label>
  <input type="radio" value="other" name="amount" id="other">
  <label for="other">Other</label>
</form>
</div>

<div id="custom">
  <h2>Donation Amount</h2>
  <form name="customDonation" id="customDonation">
  <div class="input-group-1">
    <label for="custom-amount">$</label>
    <input id="custom-amount" name="custom-amount" type="text">
    <div class="warn"></div>
  </div>
  </form>
  <div class="clearfix">
    <button class="back" type="button">Back
      <span></span>
      <span></span>
      <span></span>
    </button>
    <button class="next" type="button">Next</button>
  </div>
</div>

<section id="details">
  <div class="contact-info">
  <h2>Basic Information</h2>
  <form class="clearfix">
    <div class="input-group-2">
    <label>First Name</label>
    <input type="text">
    </div>
    <div class="input-group-2">
    <label>Last Name</label>
    <input type="text">
    </div>
    <div class="input-group-1">
    <label>Email Address</label>
    <input type="text">
    </div>
    <hr>
    <div class="input-group-1">
    <label>Street Address</label>
    <input type="text">
    </div>
    <div class="input-group-3">
    <label>City</label>
    <input type="text">
    </div>
    <div class="input-group-3">
    <label>State</label>
    <input type="text">
    </div>
    <div class="input-group-3">
    <label>Zip Code</label>
    <input type="text">
    </div>
  </form>
  <div class="clearfix">
    <button class="back" type="button">Back
      <span></span>
      <span></span>
      <span></span>
    </button>
    <button class="next" type="button">Next</button>
  </div>
  </div>
</section>

<section id="card">
    <div class="contact-info">
  <h2>Payment Information</h2>
  <form class="clearfix">
    <div class="input-group-1">
    <label>Card Number</label>
    <input type="text">
    </div>
    <div class="clearfix">
    <div class="input-group-2">
    <label>Expiration Date</label>
    <input type="text">
    </div>
    
    <div class="input-group-2">
    <label>Security Code (CVV)</label>
    <input type="text">
    </div>
    </div>
    <hr>
    <div class="input-group-1">
    <label>Employer</label>
    <input type="text">
    </div>
    
    <div class="input-group-1">
    <label>Occupation</label>
    <input type="text">
    </div>
  </form>
  <div class="clearfix">
    <button class="back" type="button">Back
      <span></span>
      <span></span>
      <span></span>
    </button>
    <button class="next" type="button">Review</button>
  </div>
  </div>
</section>

<section class="processing">
<div class="check">
  <span></span>
  <div class="mask">
  </div>
  <span></span>
</div>

<div class="outer">
  <div class="inner">
  </div>
  <div class="progress">
  </div>
</div>
<span class="message">Processing</span>
</section>

<section id="check">
  <h2>Confirm Payment</h2>
  <p>Please confirm your contribution of</p>
  <span>$8888</span>
  <button class="next" type="button">Confirm</button>
</section>

<section id="confirm">
  <h2>Thank You!</h2>
  <p>Your <span class="amount">$25</span> donation will help us reach <strong>570</strong>!</p>
</section>
!

CSS 

              
                body{
  background-color: #3672d7 ;
  text-align: center;
  font-family: 'Lato';
  font-weight: 900;
}

hr{
  background-color: #96bdff;
  border:0;
  opacity: 0.2;
  height: 2px;
  margin-top: 1.4em;
}

button{
  margin-top: 4em;
  background-color: #ff3a3a;
  border: 1px solid #ff7373 ;
  color: white;
  font-family: 'Lato';
  text-transform: uppercase;
  font-weight: 900;
  font-size: 1.4rem;
  letter-spacing: 0.1em;
  padding: 0.5em 0em;
  width: 12rem;
  border-radius: 0.3rem;
  outline: none;
  .active &{
    border-bottom: 1px solid #ccc;
    border-radius: 0.3rem 0.3rem 0 0;
  }
}
.donate form{
  display: none;
  width: 12rem;
  -webkit-box-shadow: 0px 0px 10px 0px #2e5eae ;
  -moz-box-shadow: 0px 0px 10px 0px #2e5eae;
  box-shadow: 0px 0px 10px 0px #2e5eae;
  padding-top: 50px;
  border-radius: 0.3rem;
  margin: 0 auto;
  margin-top: -50px;
  .active & {
    //display: block;
  }
}
.donate input{
  -webkit-appearance: none;
  display: none;
   position: absolute;
}
.donate label{
  display: block;
  background-color: #f2f2f2;
  color: #356bc6;
  padding: 0.5em 0;
  width: 12rem;
  font-size: 1.4rem;
  margin: 0 auto;
  border-bottom: 1px solid #ddd;
  transition: all 0.05s ease;
  &:hover, &:focus{
    background-color: #ffffff;
    color: #2dbb55;
    -ms-transform: scale(1.02,1.02); /* IE 9 */
    -webkit-transform: scale(1.02,1.02); /* Safari */
    transform: scale(1.02,1.02);
    -webkit-box-shadow: 0px 0px 10px 0px rgba(0,0,0,0.2) ;
    -moz-box-shadow: 0px 0px 10px 0px rgba(0,0,0,0.2) ;
    box-shadow: 0px 0px 10px 0px rgba(0,0,0,0.2);
  }
  &:last-child{
    border-radius: 0 0 0.3rem 0.3rem;
  }
}

#custom{
  max-width: 400px;
  margin: 0 auto;
  display: none;
  padding-top: 7em;
  h2{
    text-align: center;
    margin: 0;
    letter-spacing: 0.2em;
    color: #96bdff;
    font-weight: 700;
    opacity: 0.7;
    text-transform: uppercase;
    font-size: 1.3em;
    padding-bottom: 0.75em;
  }
  .input-group-1{
    width: 100%;
    margin-bottom: 0em;
    position: relative;
  }
  label{
    text-align: left;
    display: block;
    color: #96bdff;
    font-weight: 700;
    font-size: 2.8em;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    margin: 1.6em 0 0.3em 0.2em;
    position: absolute;
    top: -1.25em;
    left: 0.5em;
  }
  input[type="text"]{
    text-align: left;
    font-family: 'Lato';
    background-color: rgba(26,68,139, 0.3);
    font-weight: 300;
    border: 0px solid rgba(132,178,255, 0.67);
    color: white;
    font-size: 2.8em;
    box-sizing: border-box;
    padding-left: 2em;
    height: 1.9em;
    width: 100%;
    border-radius: 3px;
    outline: none;
  }
  button{
    background-color: #2dbb55;
    border-color: #2dbb55;
    font-size: 1.2em;
    margin-top: 1.2em;
    transition: all 0.2s ease;
    &:hover, &:focus{
      //background-color: red;
      -ms-transform: scale(1.04,1.04); /* IE 9 */
    -webkit-transform: scale(1.04,1.04); /* Safari */
    transform: scale(1.04,1.04);
    -webkit-box-shadow: 0px 0px 10px 0px rgba(0,0,0,0.2) ;
    -moz-box-shadow: 0px 0px 10px 0px rgba(0,0,0,0.2) ;
    box-shadow: 0px 0px 10px 0px rgba(0,0,0,0.2);
    }
  }
  .back{
    float: left;
    position: relative;
    text-indent: -999em;
    background-color: transparent;
    border: 3px solid #2e64c0;
    width: 2.4em;
    height: 2.4em;
    border-radius: 50%;
    span{
      position: absolute;
      display: block;
      background-color: #2e64c0;
      width: 60%;
      top: 50%;
      margin-top: -1.5px;
      left: 20%;
      height: 3px;
      border-radius: 3px;
      &:nth-child(2){
        width: 40%;
        top: 64%;
        left: 17%;
        -ms-transform: rotate(45deg); /* IE 9 */
        -webkit-transform: rotate(45deg); /* Safari */
        transform: rotate(45deg);
      }
      &:nth-child(3){
        width: 40%;
        top: 36%;
        left: 17%;
        -ms-transform: rotate(-45deg); /* IE 9 */
        -webkit-transform: rotate(-45deg); /* Safari */
        transform: rotate(-45deg);
      }
    }
  }
  .warn{
    display: none;
  }
  .next{
    float: right;
  }
}

#details{
  padding-top: 7em;
  text-align: left;
  display: none;
  text-align: center;
  margin: 0;
  .back{
    float: left;
    position: relative;
    text-indent: -999em;
    background-color: transparent;
    border: 3px solid #2e64c0;
    width: 2.4em;
    height: 2.4em;
    border-radius: 50%;
    span{
      position: absolute;
      display: block;
      background-color: #2e64c0;
      width: 60%;
      top: 50%;
      margin-top: -1.5px;
      left: 20%;
      height: 3px;
      border-radius: 3px;
      &:nth-child(2){
        width: 40%;
        top: 64%;
        left: 17%;
        -ms-transform: rotate(45deg); /* IE 9 */
        -webkit-transform: rotate(45deg); /* Safari */
        transform: rotate(45deg);
      }
      &:nth-child(3){
        width: 40%;
        top: 36%;
        left: 17%;
        -ms-transform: rotate(-45deg); /* IE 9 */
        -webkit-transform: rotate(-45deg); /* Safari */
        transform: rotate(-45deg);
      }
    }
  }
  .next{
    float: right;
  }
  h2{
    text-align: center;
    margin: 0;
    letter-spacing: 0.2em;
    color: #96bdff;
    font-weight: 700;
    opacity: 0.7;
    text-transform: uppercase;
    font-size: 1.3em;
    padding-bottom: 0.75em;
  }
  .input-group-1{
    width: 100%;
    margin-bottom: 0em;
  }
  .input-group-2{
    width: 48.33114%;
    margin-right: 1.33772%;
    margin-bottom: 1.2em;
    float: left;
    &:nth-child(2n){
      float: right;
      margin-right: 0;
    }
  }
  .input-group-3{
    width: 37.952%;
    margin-right: 3.33772%;
    margin-bottom: 1.2em;
    float: left;
    &:nth-child(6n){
      width: 17%;
    }
    &:nth-child(7n){
      float: right;
      margin-right: 0;
    }
  }
  .contact-info{
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
  }
  label{
    text-align: left;
    display: block;
    color: white;
    font-weight: 300;
    font-size: 0.8em;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    margin: 1.6em 0 0.3em 0.2em;
  }
  input[type="text"]{
    text-align: left;
    font-family: 'Lato';
    background-color: rgba(26,68,139, 0.3);
    font-weight: 300;
    border: 0px solid rgba(132,178,255, 0.67);
    color: white;
    font-size: 1.3em;
    box-sizing: border-box;
    padding-left: 0.75em;
    height: 2.2em;
    width: 100%;
    border-radius: 3px;
    outline: none;
  }
  button{
    background-color: #2dbb55;
    border-color: #2dbb55;
    font-size: 1.2em;
    margin-top: 1.2em;
    transition: all 0.2s ease;
    &:hover, &:focus{
      //background-color: red;
      -ms-transform: scale(1.04,1.04); /* IE 9 */
    -webkit-transform: scale(1.04,1.04); /* Safari */
    transform: scale(1.04,1.04);
    -webkit-box-shadow: 0px 0px 10px 0px rgba(0,0,0,0.2) ;
    -moz-box-shadow: 0px 0px 10px 0px rgba(0,0,0,0.2) ;
    box-shadow: 0px 0px 10px 0px rgba(0,0,0,0.2);
    }
  }
}

#card{
  padding-top: 7em;
  text-align: left;
  display: none;
  text-align: center;
  margin: 0;
  hr{
    margin-top: 0.2em;
  }
  .back{
    float: left;
    position: relative;
    text-indent: -999em;
    background-color: transparent;
    border: 3px solid #2e64c0;
    width: 2.4em;
    height: 2.4em;
    border-radius: 50%;
    span{
      position: absolute;
      display: block;
      background-color: #2e64c0;
      width: 60%;
      top: 50%;
      margin-top: -1.5px;
      left: 20%;
      height: 3px;
      border-radius: 3px;
      &:nth-child(2){
        width: 40%;
        top: 64%;
        left: 17%;
        -ms-transform: rotate(45deg); /* IE 9 */
        -webkit-transform: rotate(45deg); /* Safari */
        transform: rotate(45deg);
      }
      &:nth-child(3){
        width: 40%;
        top: 36%;
        left: 17%;
        -ms-transform: rotate(-45deg); /* IE 9 */
        -webkit-transform: rotate(-45deg); /* Safari */
        transform: rotate(-45deg);
      }
    }
  }
  .next{
    float: right;
  }
  h2{
    text-align: center;
    margin: 0;
    letter-spacing: 0.2em;
    color: #96bdff;
    font-weight: 700;
    opacity: 0.7;
    text-transform: uppercase;
    font-size: 1.3em;
    padding-bottom: 0.75em;
  }
  .input-group-1{
    width: 100%;
    margin-bottom: 0em;
  }
  .input-group-2{
    width: 48.33114%;
    margin-right: 1.33772%;
    margin-bottom: 1.2em;
    float: left;
    &:nth-child(2n){
      float: right;
      margin-right: 0;
    }
  }
  .input-group-3{
    width: 37.952%;
    margin-right: 3.33772%;
    margin-bottom: 1.2em;
    float: left;
    &:nth-child(5n){
      width: 17%;
    }
    &:nth-child(3n){
      float: right;
      margin-right: 0;
    }
  }
  .contact-info{
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
  }
  label{
    text-align: left;
    display: block;
    color: white;
    font-weight: 300;
    font-size: 0.8em;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    margin: 1.6em 0 0.3em 0.2em;
  }
  input[type="text"]{
    text-align: left;
    font-family: 'Lato';
    background-color: rgba(26,68,139, 0.3);
    font-weight: 300;
    border: 0px solid rgba(132,178,255, 0.67);
    color: white;
    font-size: 1.3em;
    box-sizing: border-box;
    padding-left: 0.75em;
    height: 2.2em;
    width: 100%;
    border-radius: 3px;
    outline: none;
  }
  button{
    background-color: #2dbb55;
    border-color: #2dbb55;
    font-size: 1.2em;
    margin-top: 1.2em;
    transition: all 0.2s ease;
    &:hover, &:focus{
      //background-color: red;
      -ms-transform: scale(1.04,1.04); /* IE 9 */
    -webkit-transform: scale(1.04,1.04); /* Safari */
    transform: scale(1.04,1.04);
    -webkit-box-shadow: 0px 0px 10px 0px rgba(0,0,0,0.2) ;
    -moz-box-shadow: 0px 0px 10px 0px rgba(0,0,0,0.2) ;
    box-shadow: 0px 0px 10px 0px rgba(0,0,0,0.2);
    }
  }
}

#check{
  padding-top: 7em;
  text-align: center;
  display: none;
  button{
    background-color: #2dbb55;
    border-color: #2dbb55;
    font-size: 1.2em;
    transition: all 0.2s ease;
    display: block;
    margin: 1.5em auto 1em;
    text-shadow: 2px 2px #1f9a42;
    &:hover, &:focus{
      //background-color: red;
      -ms-transform: scale(1.04,1.04); /* IE 9 */
      -webkit-transform: scale(1.04,1.04); /* Safari */
      transform: scale(1.04,1.04);
      -webkit-box-shadow: 0px 0px 10px 0px rgba(0,0,0,0.2) ;
      -moz-box-shadow: 0px 0px 10px 0px rgba(0,0,0,0.2) ;
      box-shadow: 0px 0px 10px 0px rgba(0,0,0,0.2);
    }
  }
  button{
    
  }
  p{
    font-weight: 300;
    letter-spacing: 0.03em;
    padding-top: 1em;
    color: white;
    margin: 0;
    font-size: 1.3em;
  }
  h2{
    text-align: center;
    margin: 0;
    letter-spacing: 0.2em;
    color: #96bdff;
    font-weight: 700;
    opacity: 0.7;
    text-transform: uppercase;
    font-size: 1.3em;
    padding-bottom: 0.75em;
  }
  span{
    display: inline-block;
    margin: 0 auto;
    border-radius: 5px;
    color: white;
    font-weight: 700;
    font-size: 3.2em;
    letter-spacing: 0.1em;
    padding: 0.2em 1em 0.3em;
    text-shadow: 2px 2px #255bb5;
  }
  
}

#confirm{
  display: none;
  height: 300px;
  &.animated{
    display: block;
  }
  h2{
    color: #96bdff;
    margin: 0;
    padding-top: 0px;
    padding-bottom: 20px;
    font-size: 3em;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
  }
  p{
    color: white;
    line-height:1.6;
    font-size: 1.4em;
    font-weight: 300;
    margin-bottom: 2em;
  }
  span{
    color: white;
    background-color: #2dbb55;
    padding: 0.25em 0.45em;
    margin: 0 0.15em;
    font-weight: 700;
    text-shadow: 2px 2px #1f9a42;
    font-size: 1em;
    border-radius: 0.2em;
  }
}

.processing{
  display: none;
  .mask{
  position: absolute;
  width: 130px;
  height: 100px;
  background-color: #3672d7;
  top: -3em;
  z-index: 999;
}

.check{
  position: relative;
  margin: 150px auto 70px;
  width: 110px;
  height:1px;
  span{
    display: block;
    position: absolute;
    height: 0.5em;
    width: 5em;
    border-radius: 3px;
    background-color: #34d461 ;
    &:first-child{
      left: 2em;
      -ms-transform: rotate(-45deg); /* IE 9 */
        -webkit-transform: rotate(-45deg); /* Safari */
        transform: rotate(-45deg);
    }
    &:last-child{
      width: 3em;
      top: 0.9em;
      left: 0.3em;
      -ms-transform: rotate(45deg); /* IE 9 */
        -webkit-transform: rotate(45deg); /* Safari */
        transform: rotate(45deg);
    }
  }
}

.outer{
  position: relative;
  background-color: #2e64c0;
  height: 0.5em;
  width: 14em;
  margin: 1em auto;
  border-radius: 3px;
}

.progress{
  //display: none;
  position: absolute;
  background-color: #528cef;
  height: 0.5em;
  width: 0em;
  top: 0em;
  left: 0;
  margin: 0;
  border-radius: 3px;
  z-index: 1;
  overflow: hidden;
}

span{
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: #96bdff;
}
}

.clearfix:before,
.clearfix:after {
  display: table;
  content: "";
}
.clearfix:after {
  clear: both;
}
!

JS 

              
                var amount;
var reach;

var x = $(window).width() - 400;

$('.donate form').on("click", function(){
  amount = $('input[name=amount]:checked', '#donAmount').val();
  reach = amount * 22;
  $('#confirm .amount').text("$" + amount);
  $('#check span').text("$" + amount);
  $('#confirm strong').text(reach + " voters");
});

$(".donate button").on("click", function(){
  $(".donate").toggleClass("active");
  if( $(".donate").is(".active") ) {
    $("form").slideDown(450, "easeOutQuart");
  } else {
    $("form").slideUp(300, "easeInOutQuad");
  }
});

$('.donate label').on("click", function(){
  setTimeout(function() {
    if (amount == "other"){
      $("#custom").css("margin-left", x/2);
$("#custom").css("margin-right", x/2);
      $('body').addClass('custom');
    	$(".donate").hide("slide", { easing: "easeInQuart", direction: "left" }, 700, function(){
    		$("#custom").show("slide", { easing: "easeOutQuart", direction: "right" }, 700);
    	});
  	} else {
      $('body').removeClass('custom');
    	$(".donate").hide("slide", { easing: "easeInQuart", direction: "left" }, 700, function(){
    		$("#details").show("slide", { easing: "easeOutQuart", direction: "right" }, 700);
  		});
  	}
  }, 150);
});

$('#custom .next').on("click", function(){
  amount = $('input[name=custom-amount]', '#customDonation').val();
  reach = amount * 22;
  $('#confirm .amount').text("$" + amount);
  $('#check span').text("$" + amount);
  $('#confirm strong').text(reach + " voters");
  $("#custom").hide("slide", { easing: "easeInQuart", direction: "left" }, 700, function(){
    $("#details").show("slide", { easing: "easeOutQuart", direction: "right" }, 700);
  });
});

$('#custom .back').on("click", function(){
  $("#custom").hide("slide", { easing: "easeInQuart", direction: "right" }, 700, function(){
    $(".donate").show("slide", { easing: "easeOutQuart", direction: "left" }, 700);
  });
});

$('#details .next').on("click", function(){
  console.log(amount);
  $("#details").hide("slide", { easing: "easeInQuart", direction: "left" }, 700, function(){
    $("#card").show("slide", { easing: "easeOutQuart", direction: "right" }, 700);
  });
});

$('#details .back').on("click", function(){
  
  if ( $('body.custom').length > 0 ){
      $("#details").hide("slide", { easing: "easeInQuart", direction: "right" }, 700, function(){
    $("#custom").show("slide", { easing: "easeOutQuart", direction: "left" }, 700);
  });
  } else {
      $("#details").hide("slide", { easing: "easeInQuart", direction: "right" }, 700, function(){
    $(".donate").show("slide", { easing: "easeOutQuart", direction: "left" }, 700);
  });
  }
  
});

$('#card .next').on("click", function(){
  $("#card").hide("slide", { easing: "easeInQuart", direction: "left" }, 700, function(){
  });
});

$('#card .back').on("click", function(){
  $("#card").hide("slide", { easing: "easeInQuart", direction: "right" }, 700, function(){
    $(".details").show("slide", { easing: "easeOutQuart", direction: "left" }, 700);
	});
});

$('#card .next').on("click", function(){
  $("#card").hide("slide", { easing: "easeInQuart", direction: "left" }, 700, function(){
    $("#check").show("slide", { easing: "easeOutQuart", direction: "right" }, 700);
  });
});

$('#check .back').on("click", function(){
  $("#check").hide("slide", { easing: "easeInQuart", direction: "right" }, 700, function(){
    $("#card").show("slide", { easing: "easeOutQuart", direction: "left" }, 700);
	});
});

$("#check .next").on('click', function(){
  $("#check").hide("slide", { easing: "easeInQuart", direction: "left" }, 700, function(){
    $(".processing").fadeIn(1500, function(){
      $(".progress").animate({ width: "14em" }, 3500, "easeInOutCirc", function() {
        $( ".mask" ).hide("slide", { easing: "easeInQuart", direction: "right" }, 400);
      });
    });
  });
  
	setTimeout(function() {
		$('.processing .message, .outer').fadeOut();
  	$("#confirm").addClass('animated fadeInUp');
	}, 6250);
});
!
999px

Console