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HTML 

              
                <a href='#' class='modal-btn'>Open Modal</a>

<div class='modal'>
	<div class='close'>
		<span></span>
		<span></span>
	</div>
	<div class='options'>
		<a href='#' class='active'>Log In</a>
		<a href='#'>Sign Up</a>
	</div>
	<div class='wrapper'>
		<div class='content'>
			<div class='inner'>
				<div class='side'>
					<form>
						<p>Already Signed Up?</p>
						<div class='field'>
							<label for='Lemail'>Email Address</label>
							<input type='email' id='Lemail' />
						</div>
						<div class='field'>
							<label for='Lpass'>Password</label>
							<input type='password' id='Lpass' />
						</div>
						<div class='field'>
							<input type='submit' value='Log In' />
						</div>
					</form>
				</div>
				<div class='side'>
					<form>
						<p>New Here?</p>
						<div class='field'>
							<label for='Sname'>Name</label>
							<input type='email' id='Sname' />
						</div>
						<div class='field'>
							<label for='Semail'>Email Address</label>
							<input type='email' id='Semail' />
						</div>
						<div class='field'>
							<label for='Spass'>Password</label>
							<input type='password' id='Spass' />
						</div>
						<div class='field'>
							<label for='Spass2'>Check Password</label>
							<input type='password' id='Spass2' />
						</div>
						<div class='field'>
							<input type='submit' value='Sign Up' />
						</div>
					</form>
				</div>
			</div>
		</div>
	</div>
</div>
<div class='overlay'></div>
!

CSS 

              
                *
	box-sizing: border-box

$red: #FF206E

body
	min-height: 100vh
	font-family: 'Raleway', sans-serif
	display: flex
	justify-content: center
	align-items: center
	background: linear-gradient(-45deg, $red, lighten(blue, 25%))	

.overlay
	width: 100%
	height: 100vh
	position: fixed
	top: 0
	left: 0
	background: rgba(black, 0.35)
	z-index: 100
	opacity: 0
	pointer-events: none
	cursor: pointer
	transition: 0.15s ease-in-out
	&.active
		opacity: 1
		pointer-events: inherit

a.modal-btn
	display: inline-block
	padding: 20px 40px
	background: $red
	color: white
	text-decoration: none
	font-size: 25px
	font-weight: bold
	transition: 0.15s ease-in-out
	&:hover
		background: white
		color: $red
		box-shadow: 0px 0px 25px 1px rgba(black, 0.5)
	
.modal
	width: calc(100% - 40px)
	max-width: 800px
	height: calc(100vh - 115px)
	max-height: 600px
	box-shadow: 0px 0px 10px 5px rgba(black, 0.35)
	position: fixed
	top: 50%
	left: 50%
	transform: translate(-50%, -50%)
	display: flex
	flex-direction: column
	opacity: 0
	pointer-events: none
	background: white
	transition: 0.15s ease-in-out
	z-index: 500
	&.active
		opacity: 1
		pointer-events: inherit
	.close
		widtH: 45px
		height: 45px
		position: absolute
		top: -10px
		left: -10px
		transform: translate(-100%, -100%)
		cursor: pointer
		transition: 0.15s ease-in-out
		@media (max-width: 940px)
			left: 0
			transform: translate(-0%, -100%)
		span
			display: block
			widtH: 45px
			height: 5px
			background: $red
			position: absolute
			top: 50%
			left: 50%
			box-shadow: 0px 0px 5px 1px black
			&:first-child
				transform: translate(-50%, -50%) rotate(45deg)
			&:last-child
				transform: translate(-50%, -50%) rotate(-45deg)
	.wrapper
		width: 100%
		height: 100%
		display: flex
		position: relative
		&:after
			content: '\f234'
			font-family: FontAwesome
			width: 50%
			height: 100%
			position: absolute
			left: 0
			font-size: 450px
			overflow: hidden
			display: flex
			justify-content: center
			align-items: center
			transition: 0.15s ease-in-out
			background: rgba($red, 0.35)
			color: rgba(black, 0.35)
			@media (max-width: 640px)
				width: 0%
		&:before
			content: '\f090'
			font-family: FontAwesome
			width: 50%
			height: 100%
			position: absolute
			right: 0
			font-size: 500px
			overflow: hidden
			display: flex
			justify-content: center
			align-items: center
			background: rgba(blue, 0.35)
			transition: 0.15s ease-in-out
			color: rgba(black, 0.35)
			@media (max-width: 640px)
				width: 100%
		&.switch
			@media (max-width: 640px)
				&:after
					width: 100%
				&:before
					width: 0%
			.content
				transform: translate(100%, 0)
				@media (max-width: 640px)
					width: 100%
					transform: translate(0%, 0)
				.inner
					transform: translate(-50%, 0)
		.content
			width: 50%
			height: 100%
			background: white
			position: relative
			overflow: hidden
			transition: 0.2s cubic-bezier(0.42, 0, 0.02, 1.21)
			z-index: 100
			@media (max-width: 640px)
				width: 100%
				background: rgba(white, 0.8)
			.inner
				width: 200%
				height: 100%
				position: absolute
				transition: 0.35s cubic-bezier(0.42, 0, 0.02, 1.21)
				top: 0
				left: 0
				display: flex
				.side
					width: 50%
					height: 100%
					overflow: auto
					padding: 20px
					display: flex
					justify-content: center
					align-items: center
					@media (max-widtH: 640px)
						align-items: flex-start
					form
						.field
							margin: 10px 0
							label
								font-size: 25px
							input[type='submit']
								font-family: 'Raleway', sans-serif
								font-size: 25px
								padding: 20px 40px
								border: none
								background: $red
								color: white
								transition: 0.15s ease-in-out
								cursor: pointer
								&:hover
									background: white
									color: $red
									box-shadow: 0px 0px 25px 1px rgba(black, 0.5)
							input[type='text'], input[type='password'], input[type='email']
								font-family: 'Raleway', sans-serif
								padding: 0px 0
								width: 100%
								font-size: 35px	
								outline: 0
								border: none
								background: none
								border-bottom: 2px solid #ccc
								transition: 0.15s ease-in-out
								&:focus
									border-bottom: 2px solid $red
									box-shadow: 0px 7px 25px 1px rgba(black, 0.15)
	.options
		display: flex
		a
			widtH: 100%
			padding: 20px
			font-size: 25px
			text-align: center
			color: black
			text-decoration: none
			transition: 0.15s ease-in-out
			font-weight: bold
			display: flex
			justify-content: center
			align-items: center
			background: white
			&:hover
				color: $red
			&.active
				box-shadow: 2px 2px 25px 1px rgba(black, 0.35)
				z-index: 100
				background: $red
				color: white
!

JS 

              
                $(".modal-btn").on('click', function(e){
	e.preventDefault()
	$(".overlay").addClass("active");
	$(".modal").addClass("active");
});

$(".modal").find(".close").click( function(){
	$(".modal").removeClass("active");
	$(".overlay").removeClass("active");
});

$(".overlay").click( function(){
	$(".modal").removeClass("active");
	$(".overlay").removeClass("active");
});


$(".modal .options a").on('click', function(e){
	if(!($(this).hasClass("active"))){
		$(this).parent().find("a.active").removeClass("active")
		$(this).addClass("active")
		$(this).parents(".modal").find(".wrapper").toggleClass("switch")
	}
});
!
999px

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