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HTML 

              
                <body>
	<header role="banner">
		<div id="cd-logo"><a href="#0"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/148866/cd-logo_1.svg" alt="Logo"></a></div>

		<nav class="main-nav">
			<ul>
				<!-- inser more links here -->
				<li><a class="cd-signin" href="#0">Sign in</a></li>
				<li><a class="cd-signup" href="#0">Sign up</a></li>
			</ul>
		</nav>
	</header>

	<div class="cd-user-modal"> <!-- this is the entire modal form, including the background -->
		<div class="cd-user-modal-container"> <!-- this is the container wrapper -->
			<ul class="cd-switcher">
				<li><a href="#0">Sign in</a></li>
				<li><a href="#0">New account</a></li>
			</ul>

			<div id="cd-login"> <!-- log in form -->
				<form class="cd-form">
					<p class="fieldset">
						<label class="image-replace cd-email" for="signin-email">E-mail</label>
						<input class="full-width has-padding has-border" id="signin-email" type="email" placeholder="E-mail">
						<span class="cd-error-message">Error message here!</span>
					</p>

					<p class="fieldset">
						<label class="image-replace cd-password" for="signin-password">Password</label>
						<input class="full-width has-padding has-border" id="signin-password" type="text"  placeholder="Password">
						<a href="#0" class="hide-password">Hide</a>
						<span class="cd-error-message">Error message here!</span>
					</p>

					<p class="fieldset">
						<input type="checkbox" id="remember-me" checked>
						<label for="remember-me">Remember me</label>
					</p>

					<p class="fieldset">
						<input class="full-width" type="submit" value="Login">
					</p>
				</form>
				
				<p class="cd-form-bottom-message"><a href="#0">Forgot your password?</a></p>
				<!-- <a href="#0" class="cd-close-form">Close</a> -->
			</div> <!-- cd-login -->

			<div id="cd-signup"> <!-- sign up form -->
				<form class="cd-form">
					<p class="fieldset">
						<label class="image-replace cd-username" for="signup-username">Username</label>
						<input class="full-width has-padding has-border" id="signup-username" type="text" placeholder="Username">
						<span class="cd-error-message">Error message here!</span>
					</p>

					<p class="fieldset">
						<label class="image-replace cd-email" for="signup-email">E-mail</label>
						<input class="full-width has-padding has-border" id="signup-email" type="email" placeholder="E-mail">
						<span class="cd-error-message">Error message here!</span>
					</p>

					<p class="fieldset">
						<label class="image-replace cd-password" for="signup-password">Password</label>
						<input class="full-width has-padding has-border" id="signup-password" type="text"  placeholder="Password">
						<a href="#0" class="hide-password">Hide</a>
						<span class="cd-error-message">Error message here!</span>
					</p>

					<p class="fieldset">
						<input type="checkbox" id="accept-terms">
						<label for="accept-terms">I agree to the <a href="#0">Terms</a></label>
					</p>

					<p class="fieldset">
						<input class="full-width has-padding" type="submit" value="Create account">
					</p>
				</form>

				<!-- <a href="#0" class="cd-close-form">Close</a> -->
			</div> <!-- cd-signup -->

			<div id="cd-reset-password"> <!-- reset password form -->
				<p class="cd-form-message">Lost your password? Please enter your email address. You will receive a link to create a new password.</p>

				<form class="cd-form">
					<p class="fieldset">
						<label class="image-replace cd-email" for="reset-email">E-mail</label>
						<input class="full-width has-padding has-border" id="reset-email" type="email" placeholder="E-mail">
						<span class="cd-error-message">Error message here!</span>
					</p>

					<p class="fieldset">
						<input class="full-width has-padding" type="submit" value="Reset password">
					</p>
				</form>

				<p class="cd-form-bottom-message"><a href="#0">Back to log-in</a></p>
			</div> <!-- cd-reset-password -->
			<a href="#0" class="cd-close-form">Close</a>
		</div> <!-- cd-user-modal-container -->
	</div> <!-- cd-user-modal -->
</body>
!

CSS 

              
                @import "bourbon";

// variables - colors

$main-text: #505260; // main text
$background: #fff; // body background color

$color-1: #343642; // blue-dark
$color-2: #2f889a; // blue-light
$color-3: #d2d8d8; // grey

$red: #d76666; // error messages

// variables - fonts 

$primary-font: 'PT Sans', sans-serif;

// variables - z-index

$header-zindex: 2;
$modal-zindex: 3;

// variables - header

$header-height-S: 50px;
$header-height-M: 80px;

// mixins - rem fallback - credits: http://zerosixthree.se/

@function calculateRem($size) {
  $remSize: $size / 16px;
  @return $remSize * 1rem;
}

@mixin font-size($size) {
  font-size: $size;
  font-size: calculateRem($size);
}

// mixins - center vertically and/or horizontally an absolute positioned element

@mixin center($xy:xy) {
  @if $xy == xy {
    left: 50%;
    top: 50%;
    bottom: auto;
    right: auto;
    @include transform(translateX(-50%) translateY(-50%));
  }
  @else if $xy == x {
    left: 50%;
    right: auto;
    @include transform(translateX(-50%));
  }
  @else if $xy == y {
    top: 50%;
    bottom: auto;
    @include transform(translateY(-50%));
  }
}

// mixins - border radius

@mixin border-radius($radius:.25em) {
  border-radius: $radius;
}

// layout - breakpoints

$S:     600px;   
$M:     768px;     
$L:     1170px;     

// layout - media queries

@mixin MQ($canvas) {
  @if $canvas == S {
   @media only screen and (min-width: $S) { @content; } 
  }
  @else if $canvas == M {
   @media only screen and (min-width: $M) { @content; } 
  }
  @else if $canvas == L {
   @media only screen and (min-width: $L) { @content; } 
  }
}

// layout - super light grid - it works with the .cd-container class

@mixin column($percentage, $float-direction:left) {
  width: 100% * $percentage;
  float: $float-direction;
}

/* -------------------------------- 

Primary style

-------------------------------- */

html * {
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

*, *:after, *:before {
	@include box-sizing(border-box);
}

body {
	font: {
		size: 100%;
		family: $primary-font;
	}
	color: $main-text;
	background-color: $background;
}

a {
	color: $color-2;
	text-decoration: none;
}

img {
	max-width: 100%;
}

input, textarea {
	font-family: $primary-font;
	@include font-size(16px);

	&::-ms-clear {
    	display: none;
	}
}

/* -------------------------------- 

Main components 

-------------------------------- */

header[role=banner] {
	position: relative;
	height: $header-height-S;
	background: $color-1;

	#cd-logo {
		float: left;
		margin: 4px 0 0 5%;

		/* reduce logo size on mobile and make sure it is left aligned with the transform-origin property */
		@include transform-origin(0 50%);
		@include transform(scale(.8));

		img {
			display: block;
		}
	}

	&::after { /* clearfix */
		content: '';
		display: table;
		clear: both;
	}

	@include MQ(M) {
		height: $header-height-M;

		#cd-logo {
			margin: 20px 0 0 5%;
			@include transform(scale(1));
		}
	}
}

.main-nav {
	float: right;
	margin-right: 5%;
	width: 44px;
	height: 100%;
	background: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/148866/cd-icon-menu.svg') no-repeat center center;
	cursor: pointer;

	ul {
		position: absolute;
		top: 0;
		left: 0;
		width: 100%;

		@include transform(translateY(-100%));

		&.is-visible {
			@include transform(translateY($header-height-S));
		}
	}

	a {
		display: block;
		height: $header-height-S;
		line-height: $header-height-S;
		padding-left: 5%;
		background: darken($color-1, 5%);
		border-top: 1px solid lighten($color-1, 3%);
		color: #FFF;
	}

	@include MQ(M) {
		width: auto;
		height: auto;
		background: none;
		cursor: auto;

		ul {
			position: static;
			width: auto;
			@include transform(translateY(0));
			line-height: $header-height-M;

			&.is-visible {
				@include transform(translateY(0));
			}
		}

		li {
			display: inline-block;
			margin-left: 1em;

			&:nth-last-child(2) {
				margin-left: 2em;
			}
		}

		a {
			display: inline-block;
			height: auto;
			line-height: normal;
			background: transparent;

			&.cd-signin, &.cd-signup {
				padding: .6em 1em;
				border: 1px solid rgba(#FFF, .6);
				border-radius: 50em;
			}

			&.cd-signup {
				background: $color-2;
				border: none;
			}
		}
	}
}

/* -------------------------------- 

xsigin/signup popup 

-------------------------------- */


.cd-user-modal {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background: rgba($color-1, .9);
	z-index: $modal-zindex;
	overflow-y: auto;
	cursor: pointer;

	visibility: hidden;
	opacity: 0;
	@include transition(opacity .3s 0, visibility 0 .3s);

	&.is-visible {
		visibility: visible;
		opacity: 1;

		@include transition(opacity .3s 0, visibility 0 0);

		.cd-user-modal-container {
			@include transform(translateY(0));
		}
	}
}

.cd-user-modal-container {
	position: relative;
	width: 90%;
	max-width: 600px;
	background: #FFF;
	margin: 3em auto 4em;
	cursor: auto;
	@include border-radius;
	@include transform(translateY(-30px));

	@include transition-property (transform);
	@include transition-duration(.3s);

	.cd-switcher {
		@include clearfix;

		li {
			@include column(.5);
			text-align: center;

			&:first-child a {
				border-radius: .25em 0 0 0;
			}

			&:last-child a {
				border-radius: 0 .25em 0 0;
			}
		}

		a {
			display: block;
			width: 100%;
			height: 50px;
			line-height: 50px;
			background: $color-3;
			color: darken($color-3, 30%);

			&.selected {
				background: #FFF;
				color: $main-text;
			}
		}
	}

	@include MQ(S) {
		margin: 4em auto;

		.cd-switcher a {
			height: 70px;
			line-height: 70px;
		}
	}
}

.cd-form {
	padding: 1.4em;

	.fieldset {
		position: relative;
		margin: 1.4em 0;

		&:first-child {
			margin-top: 0;
		}

		&:last-child {
			margin-bottom: 0;
		}
	}

	label {
		@include font-size(14px);

		&.image-replace {
			/* replace text with an icon */
			display: inline-block;
			position: absolute;
			left: 15px;
			@include center(y);
			height: 20px;
			width: 20px;

			overflow: hidden;
			text-indent: 100%;
			white-space: nowrap;
			color: transparent;
			text-shadow: none;

			background-repeat: no-repeat;
			background-position: 50% 0;
		}

		&.cd-username {
			background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/148866/cd-icon-username.svg');
		}

		&.cd-email {
			background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/148866/cd-icon-email.svg');
		}

		&.cd-password {
			background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/148866/cd-icon-password.svg');
		}
	}

	input {
		margin: 0;
		padding: 0;
		@include border-radius;

		&.full-width {
			width: 100%;
		}

		&.has-padding {
			padding: 12px 20px 12px 50px;
		}

		&.has-border {
			border: 1px solid $color-3;
			@include appearance(none);

			&:focus {
				border-color: $color-1;
				box-shadow: 0 0 5px rgba($color-1, .1);
				outline: none;
			}
		}

		&.has-error {
			border: 1px solid $red;
		}

		&[type=password] { 
			/* space left for the HIDE button */
			padding-right: 65px; 
		}

		&[type=submit] {
			padding: 16px 0;
			cursor: pointer;
			background: $color-2;
			color: #FFF;
			font-weight: bold;
			border: none;
			@include appearance(none);

			.no-touch &:hover, .no-touch &:focus {
				background: lighten($color-2, 5%);
				outline: none;
			}
		}
	}

	.hide-password {
		display: inline-block;
		position: absolute;
		right: 0;
		top: 0;
		padding: 6px 15px;
		border-left: 1px solid $color-3;
		@include center(y);
		@include font-size(14px);
		color: $color-1;
	}

	.cd-error-message {
		display: inline-block;
		position: absolute;
		left: -5px;
		bottom: -35px;
		background: rgba($red, .9);
		padding: .8em;
		z-index: 2;
		color: #FFF;
		@include font-size(13px);
		@include border-radius;

		/* prevent click and touch events */
		pointer-events: none;

		visibility: hidden;
		opacity: 0;

		@include transition(opacity .2s 0, visibility 0 .2s);

		&::after {
			/* triangle */
			content: '';
			position: absolute;
			left: 22px;
			bottom: 100%;
			@include triangle(16px, rgba($red, .9), up);
		}

		&.is-visible {
			opacity: 1;
			visibility: visible;

			@include transition(opacity .2s 0, visibility 0 0);
		}
	}

	@include MQ(S) {
		padding: 2em;

		.fieldset {
			margin: 2em 0;

			&:first-child {
				margin-top: 0;
			}

			&:last-child {
				margin-bottom: 0;
			}
		}

		input.has-padding {
			padding: 16px 20px 16px 50px;
		}

		input[type=submit] {
			padding: 16px 0;
		}
	}
}

.cd-form-message {
	padding: 1.4em 1.4em 0;
	@include font-size(14px);
	line-height: 1.4;
	text-align: center;

	@include MQ(S) {
		padding: 2em 2em 0;
	}
}

.cd-form-bottom-message {
	position: absolute;
	width: 100%;
	left: 0;
	bottom: -30px;
	text-align: center;
	@include font-size(14px);

	a {
		color: #FFF;
		text-decoration: underline;
	}
}

.cd-close-form {
	/* form X button on top right */
	display: block;
	position: absolute;
	width: 40px;
	height: 40px;
	right: 0;
	top: -40px;
	background: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/148866/cd-icon-close.svg') no-repeat center center;
	text-indent: 100%;
	white-space: nowrap;
	overflow: hidden;

	@include MQ(L) {
		display: none;
	}
}

#cd-login, #cd-signup, #cd-reset-password {
	display: none;
}

#cd-login.is-selected, #cd-signup.is-selected, #cd-reset-password.is-selected {
	display: block;
}
!

JS 

              
                jQuery(document).ready(function($){
	var $form_modal = $('.cd-user-modal'),
		$form_login = $form_modal.find('#cd-login'),
		$form_signup = $form_modal.find('#cd-signup'),
		$form_forgot_password = $form_modal.find('#cd-reset-password'),
		$form_modal_tab = $('.cd-switcher'),
		$tab_login = $form_modal_tab.children('li').eq(0).children('a'),
		$tab_signup = $form_modal_tab.children('li').eq(1).children('a'),
		$forgot_password_link = $form_login.find('.cd-form-bottom-message a'),
		$back_to_login_link = $form_forgot_password.find('.cd-form-bottom-message a'),
		$main_nav = $('.main-nav');

	//open modal
	$main_nav.on('click', function(event){

		if( $(event.target).is($main_nav) ) {
			// on mobile open the submenu
			$(this).children('ul').toggleClass('is-visible');
		} else {
			// on mobile close submenu
			$main_nav.children('ul').removeClass('is-visible');
			//show modal layer
			$form_modal.addClass('is-visible');	
			//show the selected form
			( $(event.target).is('.cd-signup') ) ? signup_selected() : login_selected();
		}

	});

	//close modal
	$('.cd-user-modal').on('click', function(event){
		if( $(event.target).is($form_modal) || $(event.target).is('.cd-close-form') ) {
			$form_modal.removeClass('is-visible');
		}	
	});
	//close modal when clicking the esc keyboard button
	$(document).keyup(function(event){
    	if(event.which=='27'){
    		$form_modal.removeClass('is-visible');
	    }
    });

	//switch from a tab to another
	$form_modal_tab.on('click', function(event) {
		event.preventDefault();
		( $(event.target).is( $tab_login ) ) ? login_selected() : signup_selected();
	});

	//hide or show password
	$('.hide-password').on('click', function(){
		var $this= $(this),
			$password_field = $this.prev('input');
		
		( 'password' == $password_field.attr('type') ) ? $password_field.attr('type', 'text') : $password_field.attr('type', 'password');
		( 'Hide' == $this.text() ) ? $this.text('Show') : $this.text('Hide');
		//focus and move cursor to the end of input field
		$password_field.putCursorAtEnd();
	});

	//show forgot-password form 
	$forgot_password_link.on('click', function(event){
		event.preventDefault();
		forgot_password_selected();
	});

	//back to login from the forgot-password form
	$back_to_login_link.on('click', function(event){
		event.preventDefault();
		login_selected();
	});

	function login_selected(){
		$form_login.addClass('is-selected');
		$form_signup.removeClass('is-selected');
		$form_forgot_password.removeClass('is-selected');
		$tab_login.addClass('selected');
		$tab_signup.removeClass('selected');
	}

	function signup_selected(){
		$form_login.removeClass('is-selected');
		$form_signup.addClass('is-selected');
		$form_forgot_password.removeClass('is-selected');
		$tab_login.removeClass('selected');
		$tab_signup.addClass('selected');
	}

	function forgot_password_selected(){
		$form_login.removeClass('is-selected');
		$form_signup.removeClass('is-selected');
		$form_forgot_password.addClass('is-selected');
	}

	//REMOVE THIS - it's just to show error messages 
	$form_login.find('input[type="submit"]').on('click', function(event){
		event.preventDefault();
		$form_login.find('input[type="email"]').toggleClass('has-error').next('span').toggleClass('is-visible');
	});
	$form_signup.find('input[type="submit"]').on('click', function(event){
		event.preventDefault();
		$form_signup.find('input[type="email"]').toggleClass('has-error').next('span').toggleClass('is-visible');
	});


	//IE9 placeholder fallback
	//credits http://www.hagenburger.net/BLOG/HTML5-Input-Placeholder-Fix-With-jQuery.html
	if(!Modernizr.input.placeholder){
		$('[placeholder]').focus(function() {
			var input = $(this);
			if (input.val() == input.attr('placeholder')) {
				input.val('');
		  	}
		}).blur(function() {
		 	var input = $(this);
		  	if (input.val() == '' || input.val() == input.attr('placeholder')) {
				input.val(input.attr('placeholder'));
		  	}
		}).blur();
		$('[placeholder]').parents('form').submit(function() {
		  	$(this).find('[placeholder]').each(function() {
				var input = $(this);
				if (input.val() == input.attr('placeholder')) {
			 		input.val('');
				}
		  	})
		});
	}

});


//credits https://css-tricks.com/snippets/jquery/move-cursor-to-end-of-textarea-or-input/
jQuery.fn.putCursorAtEnd = function() {
	return this.each(function() {
    	// If this function exists...
    	if (this.setSelectionRange) {
      		// ... then use it (Doesn't work in IE)
      		// Double the length because Opera is inconsistent about whether a carriage return is one character or two. Sigh.
      		var len = $(this).val().length * 2;
      		this.setSelectionRange(len, len);
    	} else {
    		// ... otherwise replace the contents with itself
    		// (Doesn't work in Google Chrome)
      		$(this).val($(this).val());
    	}
	});
};
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