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HTML 

              
                <body>
    	<div class="container">
    		<h1>
    			<span class="blue">G</span>
    			<span class="red">i</span>
    			<span class="purple">p</span>
    			<span class="green">h</span>
    			<span class="pink">y</span> <small>Captcha.</small></h1>
	        <form>
	        	<div class="formData">
		        	<div class="formDiv">
		        		<input type="text" required>
			        	<label class="label">Your Name</label>
			        </div>
			        <div class="formDiv">
			        	<input type="text" required>
			        	<label class="label">Email</label>
			        </div>

			        <div class="formDiv">
			        	<div class="checkboxDiv">
				        	<div class="checkbox">
					        	<input type="checkbox" id="checkForRobot">
					        	<label for="checkForRobot"></label>
				        	</div>
				        	<span>I'm not a robot.</span>
				        </div>
			        </div>

			        <div class="captchaDiv close">
			        	<div id="giphy_captcha"></div>
			        	<input type="text" placeholder="What are you seeing? (e.g. cat, dog,  funny)" id="captcha_input" required>
			        	<span>*Describe what you see in the above GIF to prove you're HUMAN. <a href="#" id="reload">Too difficult? Reload GIF</a></span>
			        </div>
			    </div>

		        <button id="submit">
		        	<span class="text">Submit</span>
		        	<div class="spinner">
						<div class="bounce1"></div>
						<div class="bounce2"></div>
						<div class="bounce3"></div>
					</div>
		        </button>
	        </form>
	    </div>
        <script src="js/main.js"></script>
    </body>
!

CSS 

              
                $white: #ffffff;
$grey: #353535;
$dark_grey: #1F2124;
$blue: #2F8BE6;
$green: #1DE9B6;
$base: 1rem;
$font_family: 'Dosis', sans-serif;

//Giphy colors
$giphy_blue: #0cf;
$giphy_pink: #e54cb5;
$giphy_purple: #93f;
$giphy_red: #fc6669;
$giphy_green: #0f9;

%formElementDefault {
	font-family: $font_family;
	font-size: $base;
	letter-spacing: 0.05em;
	box-sizing: border-box;
	outline: 0;
	border-radius: 2px;
}

%input {
	@extend %formElementDefault;
	background: rgba($dark_grey, .5);
	border: 1px solid rgba($white, .1);
	color: white;
	padding: 10px 8px 0;
}
%input-white {
	@extend %input;
	background: $white;
	color: $grey;
	border:none;
}

/* 
	Amazing CSS Spinner from
	http://tobiasahlin.com/spinkit/
*/
.spinner {
  margin: 0 auto;
  width: 70px;
  text-align: center;
  transform: scale(0.5);

  > div {
	width: 18px;
	height: 18px;
	background-color: $white;

	border-radius: 100%;
	display: inline-block;
	animation: sk-bouncedelay 1.4s infinite ease-in-out both;
  }
  .bounce1{
  	animation-delay: -0.32s;
  }
  .bounce2{
  	animation-delay: -0.16s;
  }
}
@keyframes sk-bouncedelay {
  0%, 80%, 100% { 
    transform: scale(0);
  } 40% { 
    transform: scale(1.0);
  }
}

* {
	margin:0;
	padding:0;
}
body {
	background: $grey;
	font-size:16px;
	text-transform: uppercase;
	font-family: $font_family;
	color: $white;
	font-weight: 200;
	letter-spacing: 0.11em;
}
a {
	color: $blue;
}
img {
  max-width: 100%;
}
h1 {
	font-weight: 200;
	text-align:center;
	margin-bottom: 20px;;
	font-size: $base * 2.5;
	letter-spacing: 0.05em;
	>span {
		font-weight: 400;
	}
	.blue {
		color: $giphy_blue;
	}
	.pink {
		color: $giphy_pink;
	}
	.red {
		color: $giphy_red;
	}
	.green {
		color: $giphy_green;
	}
	.purple {
		color: $giphy_purple;
	}
}
.container {
	max-width:600px;
	margin: 50px auto 0;
}

form {
	width:400px;
	margin: 0 auto;
	color: $white;

	.formDiv {
		position:relative;
		margin-bottom: 20px;
	

		.label {
			position:absolute;
			top:50%;
			left:10px;
			transform: translateY(-50%);
			opacity: .3;
			z-index: 2;
			transition: all .5s ease;
		}
		input{
			@extend %input;
			position:relative; 
			z-index: 3;
			&[type="text"] {
				width: 100%;
				height:60px;
				box-shadow: inset 0 0 10px 1px rgba(#000, 0);
				transition: all .5s ease;
				&:focus {
					box-shadow: inset 0 0 10px 2px rgba(#000, .3);
				}
				&:focus ~ .label,
				&:valid ~ .label {
					top:15px;
					font-size: 10px;
					opacity: .8;
					z-index: 4;
				}
			}
			&[type="checkbox"]{
				visibility: hidden;
			}
		}

		.checkboxDiv {
			position:relative;

			.checkbox,
			> span {
				display: inline-block;
				vertical-align: middle;
			}

			.checkbox {
				width: 24px;
				height: 24px;
				position:relative;
				margin-right: 5px;

				label {
					@extend %input;
					position:absolute;
					top:0;
					left:0;
					width: 100%;
					height: 100%;
					transition: all .5s ease;
				}

				input[type="checkbox"]:checked ~ label {
					box-shadow: inset 0 0 3px 2px rgba(#000, .3);
					&:after {
						content: "\f00c";
						font-family: FontAwesome;
						font-size: $base * 0.75;
						position: absolute;
						top: 50%;
						left: 50%;
						transform: translateX(-50%) translateY(-50%);
					}
				}
			}
		}
	}
	
	.captchaDiv {
		overflow-y: hidden;
		max-height: 800px;
		transition: all .8s ease;

		&.close {
			max-height: 0;
		}

		#giphy_captcha {
			background: $dark_grey;
			text-align: center;
			border-radius: 2px 2px 0 0;
			transition:  all .3s linear;
		}
		input[type="text"]{
			@extend %input-white;
			padding-top: 0;
			margin-bottom: 10px;
			width: 100%;
			height: 50px;
		}
		span {
			display: block;
			text-transform: initial;
			margin-bottom: 20px;
		}
	}

	.formData {
		position: relative;
		
		&.disabled {
			&:after {
				content: '';
				position:absolute;
				top:0;
				left:0;
				width: 100%;
				height: 100%;
				background: rgba($grey, .6);
				z-index: 10;
			}
		}
	}
		
}

button {
	@extend %formElementDefault;
	width: 100%;
	height: 60px;
	text-align: center;
	background: $blue;
	color: $white;
	border:none;
	text-transform: uppercase;
	cursor: pointer;
	transition: all .3s linear;

	.spinner {
		display: none;
	}

	&:hover {
		background: darken($blue, 10%);
	}

	&:disabled {
		background: $green;
		cursor: default;
	}
}
!

JS 

              
                var API_KEY = 'dc6zaTOxFJmzC'; //Giphy Public API Key
var URL = 'https://api.giphy.com/v1/gifs/search?api_key='+API_KEY;

var loaded = false;
var formData = {
	q: 'monkeys cats dogs birds',
	limit: 1,
	rating: 'pg',
};
var counter = 0;
var currentSlug = null;

$(document).ready(function(){
	$('#checkForRobot').change(function(){
		if($(this).is(':checked')){
			
			if(!loaded){
				$.ajax({
					url: URL,
					data: formData,
					dataType: 'json',
					success: function(data){
						console.log(data, data.data[0].images.downsized.url);
						var dataObj = data.data[0];
						var imgObj = dataObj.images.downsized;
						var imgSrc = imgObj.url;
						var imgWidth = imgObj.width;
						var imgHeight = imgObj.height;

						
						$('<img src="'+imgSrc+'" width="'+imgWidth+'" height="'+imgHeight+'">').appendTo('#giphy_captcha');
						$('.captchaDiv').toggleClass('close');

						currentSlug = dataObj.slug;
					},
					error: function(error){
						console.log(error);
					},
					complete: function(){
						loaded = true;
					}
				});
			}else {
				$('.captchaDiv').toggleClass('close');
			}
			
		}else {
			$('.captchaDiv').toggleClass('close');
		}
	});

	//reload
	$('#reload').click(function(){
		counter++;

		if(loaded){
			
			if(counter > 0){
				formData['offset'] = counter;
			}

			$.ajax({
				url: URL,
				data: formData,
				dataType: 'json',
				beforeSend: function(){
					$('#giphy_captcha').height($('#giphy_captcha img').height());
					$('#giphy_captcha img').remove();
				},
				success: function(data){
					console.log(data, data.data[0].images.downsized.url);
					var dataObj = data.data[0];
					var imgObj = dataObj.images.downsized;
					var imgSrc = imgObj.url;
					var imgWidth = imgObj.width;
					var imgHeight = imgObj.height;

					$('#giphy_captcha').height(imgHeight);
					$('<img src="'+imgSrc+'" width="'+imgWidth+'" height="'+imgHeight+'">').appendTo('#giphy_captcha');

					currentSlug = dataObj.slug;
				},
				error: function(error){
					console.log(error);
				}
			});
		}
		return false;
	});

	//submit function
	$('#submit').click(function(e){

		var btn = $(this),
			spinner = btn.children('.spinner'),
			text = btn.children('.text');


		if($("form")[0].checkValidity()){
			e.preventDefault();

			text.hide(0);
			spinner.fadeIn();
			
			var captcha_field = $('#captcha_input').val();
			var formatedCurrentSlug = currentSlug != null ? currentSlug.replace(/-/g, ' ') : null;
      
      //This is how validation works.
      //However, `slug` doesn't always describe
      //what the GIF is about so 
      //validation is a bit shaky
      //there should be better ideas ;)
			if(formatedCurrentSlug.indexOf(captcha_field) > -1){
				console.log('validated!');
				spinner.fadeOut(300, function(){
					text.html('Succcess!!!').show(0);
					btn.prop('disabled', true);
					$('.captchaDiv').toggleClass('close');
					$('.formData').addClass('disabled');
				});
			}else {
				spinner.fadeOut(300, function(){
					text.html('Try Again :(').show(0);
				});
				
			}
		}
	});
});
!
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