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CSS

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HTML 

              
                <button class="bg-toggle">Toggle dark/light</button>

<form action="#" novalidate>
	<div class="form-group has-icon fa-envelope-o">
		<label class="movable" for="email">Email address</label>
		<input type="email" name="email" id="email" class="form-field required email" />
		<span class="error-message">Please enter a valid email address</span>
	</div>
	<div class="form-group has-icon fa-user-o">
		<label class="movable" for="name">Name</label>
		<input type="text" name="name" id="name" class="form-field required" />
		<span class="error-message">This is a required field with a much longer error message to see what it's like with multiple lines</span>
	</div>
	<div class="form-group has-icon fa-comment-o">
		<label class="movable" for="comment">Comment</label>
		<textarea name="comment" id="comment" rows="6" class="form-field required"></textarea>
		<span class="error-message">Comment perhaps?</span>
	</div>
	<div class="form-group has-icon select fa-heart-o">
		<label class="movable" for="options">Select an option</label>
		<select name="options" id="options" class="form-field required">
			<option value="" selected>Select an option</option>
			<option value="1">This is a great option</option>
			<option value="2">This option is cool too</option>
			<option value="3">This option is okay I guess</option>
		</select>
		<span class="error-message">Select something tho...</span>
	</div>
	<div class="form-group has-icon select dropdown-up fa-diamond">
		<label class="movable" for="moreoptions">Another dropdown but up this time</label>
		<select name="moreoptions" id="moreoptions" class="form-field required">
			<option value="" selected>Another dropdown but up this time</option>
			<option value="1">How about checking what an option that's longer than one line looks like?</option>
			<option value="2">Lorem my ipsum</option>
			<option value="3">Me: *adds placeholder*</option>
			<option value="4">Place: *is hold*</option>
		</select>
		<span class="error-message">Select something tho...</span>
	</div>
	<div class="form-group checkbox">
		<input type="checkbox" class="fa fa-check" name="news" id="news" />
		<label for="news">Get news updates</label>
	</div>
	<div class="form-group">
		<button type="submit" class="form-submit">Submit Form</button>
	</div>
</form>
!

CSS 

              
                @keyframes iconWiggle {
	0% { transform: rotate(0deg) }
	20% { transform: rotate(15deg) }
	40% { transform: rotate(-15deg) }
	60% { transform: rotate(15deg) }
	80% { transform: rotate(-15deg) }
	100% { transform: rotate(0deg) }
}

@keyframes iconPinch {
	0% { transform: scale(1) }
	50% { transform: scale(0.8) }
	100% { transform: scale(1) }
}

html {
	font-size: 14px;
}

body {
	background: #fff;
	color: #2b3452;
	font-family: 'Open Sans', sans-serif;
	transition: background-color 0.2s;

	&.dark {
		background-color: #2b3452;
	}
}

form {
	box-sizing: border-box;
	max-width: 100%;
	width: 420px;
	padding: 0 15px;
	margin: 15px auto 50px;
}

.form-group {
	margin-top: 1.6rem;
	position: relative;
	min-height: 3rem;
	line-height: 3rem;
		
	&.checkbox {
		line-height: 1.5rem;
		min-height: 1.5rem;
	}

	label.movable {
		position: absolute;
		pointer-events: none;
		top: 0;
		z-index: 2;
		height: 3rem;
		line-height: 3rem;
		color: darken(#d8dbe8,10%);
		padding: 0 15px;
		font-size: 1rem;
		font-weight: 400;
		transition: all 0.2s;
	}

	.form-field {
		border: 1px solid darken(#d8dbe8,5%);
		transition-property: border, box-shadow;
		transition-duration: 0.2s;
		-webkit-appearance: none;
		-moz-appearance: none;
		//firefox specific - hide select arrow
		text-indent: 0.01px;
		text-overflow: "";
		//ie specific - hide select arrow
		&::-ms-expand {
			display: none;
		}
		option {
			color: black;
		}
	}

	.form-field, .form-submit {
		color: inherit;
		display: block;
		position: relative;
		z-index: 1;
		font-size: inherit;
		width: 100%;
		box-sizing: border-box;
		border-radius: 4px;
		background: white;
		padding: 12px 15px;
		min-height: 3rem;

		&:not(textarea) {
			height: 3rem;
			padding: 0 15px;
		}
	}

	textarea {
		resize: vertical;
	}
	
	input[type="checkbox"] {
		width: 16px;
		height: 16px;
		vertical-align: middle;
		-webkit-appearance: none;
		-moz-appearance: none;
		border: 1px solid #c8ccdf;
		line-height: 14px;
		text-align: center;
		border-radius: 4px;
		margin-right: 5px;
		color: #0a78f5;
		font-size: 12px;
		transition: all 0.2s;
		background: white;
		
		&::before {
			opacity: 0;
			transition: opacity 0.1s;
		}
		
		&:checked::before {
			opacity: 1;
		}
	}
	
	.form-field, input[type="checkbox"] {
		&:focus {
			box-shadow: 0 0 4px 3px fade(#3b93f7,20%);
			border: 1px solid #3b93f7;
			outline: none;
		}
		
		+ label {
			color: darken(#d8dbe8,15%);
		}
	}

	.error-message {
		box-sizing: border-box;
		color: white;
		font-size: 0.8rem;
		line-height: 1.2rem;
		font-weight: 600;
		position: absolute;
		top: 100%;
		left: 5px;
		z-index: 3;
		margin-top: 2px;
		background: #e66051;
		max-width: calc(~"100% - 10px");
		padding: 5px 10px 5px 30px;
		border-radius: 4px;
		box-shadow: 0 2px 10px fade(black,10%);
		transition: transform 0.2s;
		transform: scale(0);
		transform-origin: 18px 0;

		&::before {
			font-family: "FontAwesome";
			content: "\f057";
			position: absolute;
			top: 5px;
			left: 12px;
			cursor: pointer;
		}

		&::after {
			content: " ";
			position: absolute;
			border: 6px solid transparent;
			border-bottom-color: #e66051;
			top: -12px;
			left: 10px;
		}
	}

	.form-submit {
		background: #3b93f7;
		color: white;
		font-weight: 600;
		font-size: 1.2rem;
		border: 0;
		transition: all 0.2s;
		cursor: pointer;

		&:hover {
			background: darken(#3b93f7,10%);
			transform: translateY(-2px);
		}

		&:active {
			transform: translateY(0);
		}
	}

	&.has-icon {
		&::before {
			font-family: "FontAwesome";
			position: absolute;
			line-height: 3rem;
			top: 0;
			left: 0;
			width: 3rem;
			text-align: center;
			z-index: 2;
			color: darken(#d8dbe8,10%);
			pointer-events: none;
			transition: color 0.2s;
			animation: none;
		}

		&.checkbox, .form-field, label.movable,  {
			padding-left: 3rem;
		}
	}

	&.moved {
		&::before {
			color: #3b93f7;
			animation: iconPinch 0.3s ease-in-out;
		}

		label.movable {
			top: -1.5rem;
			height: 1rem;
			line-height: 1.5rem;
			font-size: 0.8rem;
			font-weight: 600;
			padding-left: 0;

			&::after {
				content: ":";
			}
		}
	}

	&.invalid {
		label {
			color: #e66051;
		}

		.error-message {
			transform: scale(1);
		}

		&::before {
			color: #e66051;
			animation: iconWiggle 0.4s ease-in-out;
		}

		.form-field {
			background: #fff5f5;
			border: 1px solid #e66051;

			&:focus {
				box-shadow: 0 0 4px 3px fade(#e66051,20%)
			}
		}
	}

	&.select {
		&::after {
			content: " ";
			position: absolute;
			right: 10px;
			border: 4px solid transparent;
			border-top-color: darken(#d8dbe8,10%);
			top: 50%;
			margin-top: -2px;
			z-index: 2;
			transition: border-top-color 0.2s;
		}

		.form-field {
			color: white;
			padding-right: 30px;
		}

		&.moved .form-field {
			color: inherit;
		}

		&.invalid::after {
			border-top-color: #e66051; 
		}
		
		.dropdown {
			position: absolute;
			z-index: 4;
			top: 100%;
			margin-top: 2px;
			left: 5px;
			right: 5px;
			background: #d8dbe8;
			padding: 0;
			border-radius: 4px;
			transform-origin: 50% 0;
			transform: scale(0);
			transition: transform 0.2s;
			box-shadow: 0 2px 10px fade(black,10%);
			padding: 5px 0;
			font-size: 0.9rem;
			line-height: 1.2rem;
			
			&::before {
				content: " ";
				position: absolute;
				top: -12px;
				border: 6px solid transparent;
				border-bottom-color: #d8dbe8;
				left: 50%;
				margin-left: -6px;
			}
			
			&.open {
				transform: scale(1);
			}
			
			li {
				list-style: none;
				
				a {
					display: block;
					padding: 10px 30px;
					text-decoration: none;
					color: #555;
					transition: background-color 0.2s;
					position: relative;
					
					&:hover, &:focus {
						background: fade(white,30%);
						outline: none;
					}
					
					&.selected {
						&::before {
							content: " ";
							position: absolute;
							left: 15px;
							top: 50%;
							margin-top: -5px;
							width: 4px;
							height: 8px;
							border: solid #3b93f7;
							border-width: 0 1px 1px 0;
							transform: rotate(45deg);
						}
					}
				}
			}
		}
		
		&.dropdown-up .dropdown {
			top: auto;
			bottom: 100%;
			margin-bottom: 2px;
			transform-origin: 50% 100%;
			
			&::before {
				top: auto;
				bottom: -12px;
				border-top-color: #d8dbe8;
				border-bottom-color: transparent;
			}
		}
	}
}

form.dark {
	.form-group {
		&.moved label {
			color: white;
		}
		&.moved.invalid label {
			color: #f58d81;
		}
		.form-submit, .form-field:not(:focus) {
			box-shadow: 0 2px 10px fade(black,10%);
		}
		.form-field, input[type="checkbox"] {
			border: 1px solid white;
		}
		input[type="checkbox"] + label {
			color: white;
		}
	}
}


.bg-toggle {
	background: #fff;
	border: 1px solid #666;
	color: #666;
	font-weight: 600;
	border-radius: 4px;
	margin: 15px;
	font-size: 12px;
	padding: 3px 5px;
	cursor: pointer;
	transition: all 0.15s;
	opacity: 0.65;

	.dark & {
		background: none;
		border-color: white;
		color: white;
	}

	&:hover {
		transform: translateY(-1px);
		opacity: 1;
	}

	&:active {
		transform: translateY(0);
	}
}
!

JS 

              
                $(".form-group .form-field").on "focus change", () ->
	unless $(this).closest(".form-group").hasClass("select") and $(this).val() is ""
		$(this).closest(".form-group").addClass("moved")
	return
.on "blur change", () ->
	if $(this).val().trim() is "" 
		$(this).closest(".form-group").removeClass("moved")
	return
.on "change keypress", () ->
	$(this).closest(".invalid").removeClass "invalid"
	return
    
window.emailRegex = /^(([^<>()\[\]\.,;:\[email protected]\"]+(\.[^<>()\[\]\.,;:\[email protected]\"]+)*)|(\".+\"))@(([^<>()[\]\.,;:\[email protected]\"]+\.)+[^<>()[\]\.,;:\[email protected]\"]{2,})$/i;

$("form").on "submit", (e) ->
	valid = true;
	form = $(this)
	form.find(".invalid").removeClass("invalid")
	form.find(".required").each () ->
		field = $(this)
		val = field.val().trim()
		if val is "" or (field.attr("type") is "email" and !emailRegex.test(val))
			valid = false;
			field.closest(".form-group").addClass "invalid"
			field.focus()
			return false
	if !valid
		e.preventDefault()
	else
		alert(form.serialize())
		e.preventDefault()
	return
    
$("form .error-message").on "click", () ->
	$(this).closest(".invalid").removeClass "invalid"
	return

$(".bg-toggle").on "click", () ->
	$('body,form').toggleClass('dark')
	return

if !(/Mobi/.test(navigator.userAgent))
	$(".form-group.select select").on "mousedown touchstart focus", (e) ->
		e.preventDefault()
		isOpen = $(this).siblings(".dropdown").hasClass "open"
		$(".form-group .dropdown").removeClass "open"
		if isOpen isnt true
			$(this).siblings(".dropdown").addClass("open")
		$(this).blur().siblings(".dropdown").find("a.selected").focus()
		return
	.each () ->
		options = $(this).find "option"
		dropdown = $("<ul></ul>").addClass "dropdown"
		options.each () ->
			optionValue = $(this).attr("value")
			optionText = $(this).text()
			li = $("<li></li>")
			option = $("<a></a>").attr({"href": "#", "data-val": optionValue}).text(optionText)
			if $(this).attr "selected"
				option.addClass "selected"
			option.on "click", (e) ->
				e.preventDefault()
				dropdown.find(".selected").removeClass("selected")
				$(this).addClass("selected")
				.closest(".form-group")
				.find("select")
				.val($(this).attr("data-val"))
				.trigger("change")
				dropdown.removeClass("open")
				return
			.on "keydown", (e) ->
				key = if e.keyCode then e.keyCode else e.which
				if key is 40
					$(this).closest("li").next("li").find("a").focus()
				else if key is 38
					$(this).closest("li").prev("li").find("a").focus()
				return
			li.append option
			dropdown.append li
		$(this).closest(".form-group").append dropdown
		return

$(document).on "click", (e) ->
	unless $(e.target).closest(".form-group.select").find(".dropdown.open").length
		$(".form-group .dropdown").removeClass "open"
!
999px

Console