<div class="container">
		<h1>Popup Login & Signup with jQuery</h1>
		<a id="modal_trigger" href="#modal" class="btn">Click here to Login or register</a>

		<div id="modal" class="popupContainer" style="display:none;">
				<header class="popupHeader">
						<span class="header_title">Login</span>
						<span class="modal_close"><i class="fa fa-times"></i></span>
				</header>

				<section class="popupBody">
						<!-- Social Login -->
						<div class="social_login">
								<div class="">
										<a href="#" class="social_box fb">
												<span class="icon"><i class="fa fa-facebook"></i></span>
												<span class="icon_title">Connect with Facebook</span>

										</a>

										<a href="#" class="social_box google">
												<span class="icon"><i class="fa fa-google-plus"></i></span>
												<span class="icon_title">Connect with Google</span>
										</a>
								</div>

								<div class="centeredText">
										<span>Or use your Email address</span>
								</div>

								<div class="action_btns">
										<div class="one_half"><a href="#" id="login_form" class="btn">Login</a></div>
										<div class="one_half last"><a href="#" id="register_form" class="btn">Sign up</a></div>
								</div>
						</div>

						<!-- Username & Password Login form -->
						<div class="user_login">
								<form>
										<label>Email / Username</label>
										<input type="text" />
										<br />

										<label>Password</label>
										<input type="password" />
										<br />

										<div class="checkbox">
												<input id="remember" type="checkbox" />
												<label for="remember">Remember me on this computer</label>
										</div>

										<div class="action_btns">
												<div class="one_half"><a href="#" class="btn back_btn"><i class="fa fa-angle-double-left"></i> Back</a></div>
												<div class="one_half last"><a href="#" class="btn btn_red">Login</a></div>
										</div>
								</form>

								<a href="#" class="forgot_password">Forgot password?</a>
						</div>

						<!-- Register Form -->
						<div class="user_register">
								<form>
										<label>Full Name</label>
										<input type="text" />
										<br />

										<label>Email Address</label>
										<input type="email" />
										<br />

										<label>Password</label>
										<input type="password" />
										<br />

										<div class="checkbox">
												<input id="send_updates" type="checkbox" />
												<label for="send_updates">Send me occasional email updates</label>
										</div>

										<div class="action_btns">
												<div class="one_half"><a href="#" class="btn back_btn"><i class="fa fa-angle-double-left"></i> Back</a></div>
												<div class="one_half last"><a href="#" class="btn btn_red">Register</a></div>
										</div>
								</form>
						</div>
				</section>
		</div>
</div>
body {
		font-family: 'Source Sans Pro', sans-serif;
		font-size: 14px;
		color: #666;
}

h1 {
		text-align: center;
		margin-bottom: 0;
		margin-top: 60px;
}

#lean_overlay {
		position: fixed;
		z-index: 100;
		top: 0px;
		left: 0px;
		height: 100%;
		width: 100%;
		background: #000;
		display: none;
}

.popupContainer {
		position: absolute;
		width: 330px;
		height: auto;
		left: 45%;
		top: 60px;
		background: #FFF;
}

#modal_trigger {
		margin: 40px auto;
		width: 200px;
		display: block;
		border: 1px solid #DDD;
		border-radius: 4px;
}

.btn {
		padding: 10px 20px;
		background: #F4F4F2;
}

.btn_red {
		background: #ED6347;
		color: #FFF;
}

.btn:hover {
		background: #E4E4E2;
}

.btn_red:hover {
		background: #C12B05;
}

a.btn {
		color: #666;
		text-align: center;
		text-decoration: none;
}

a.btn_red {
		color: #FFF;
}

.one_half {
		width: 50%;
		display: block;
		float: left;
}

.one_half.last {
		width: 45%;
		margin-left: 5%;
}
/* Popup Styles*/

.popupHeader {
		font-size: 16px;
		text-transform: uppercase;
}

.popupHeader {
		background: #F4F4F2;
		position: relative;
		padding: 10px 20px;
		border-bottom: 1px solid #DDD;
		font-weight: bold;
}

.popupHeader .modal_close {
		position: absolute;
		right: 0;
		top: 0;
		padding: 10px 15px;
		background: #E4E4E2;
		cursor: pointer;
		color: #aaa;
		font-size: 16px;
}

.popupBody {
		padding: 20px;
}
/* Social Login Form */

.social_login {}

.social_login .social_box {
		display: block;
		clear: both;
		padding: 10px;
		margin-bottom: 10px;
		background: #F4F4F2;
		overflow: hidden;
}

.social_login .icon {
		display: block;
		width: 10px;
		padding: 5px 10px;
		margin-right: 10px;
		float: left;
		color: #FFF;
		font-size: 16px;
		text-align: center;
}

.social_login .fb .icon {
		background: #3B5998;
}

.social_login .google .icon {
		background: #DD4B39;
}

.social_login .icon_title {
		display: block;
		padding: 5px 0;
		float: left;
		font-weight: bold;
		font-size: 16px;
		color: #777;
}

.social_login .social_box:hover {
		background: #E4E4E2;
}

.centeredText {
		text-align: center;
		margin: 20px 0;
		clear: both;
		overflow: hidden;
		text-transform: uppercase;
}

.action_btns {
		clear: both;
		overflow: hidden;
}

.action_btns a {
		display: block;
}
/* User Login Form */

.user_login {
		display: none;
}

.user_login label {
		display: block;
		margin-bottom: 5px;
}

.user_login input[type="text"],
.user_login input[type="email"],
.user_login input[type="password"] {
		display: block;
		width: 90%;
		padding: 10px;
		border: 1px solid #DDD;
		color: #666;
}

.user_login input[type="checkbox"] {
		float: left;
		margin-right: 5px;
}

.user_login input[type="checkbox"]+label {
		float: left;
}

.user_login .checkbox {
		margin-bottom: 10px;
		clear: both;
		overflow: hidden;
}

.forgot_password {
		display: block;
		margin: 20px 0 10px;
		clear: both;
		overflow: hidden;
		text-decoration: none;
		color: #ED6347;
}
/* User Register Form */

.user_register {
		display: none;
}

.user_register label {
		display: block;
		margin-bottom: 5px;
}

.user_register input[type="text"],
.user_register input[type="email"],
.user_register input[type="password"] {
		display: block;
		width: 90%;
		padding: 10px;
		border: 1px solid #DDD;
		color: #666;
}

.user_register input[type="checkbox"] {
		float: left;
		margin-right: 5px;
}

.user_register input[type="checkbox"]+label {
		float: left;
}

.user_register .checkbox {
		margin-bottom: 10px;
		clear: both;
		overflow: hidden;
}
// Plugin options and our code
$("#modal_trigger").leanModal({
		top: 100,
		overlay: 0.6,
		closeButton: ".modal_close"
});

$(function() {
		// Calling Login Form
		$("#login_form").click(function() {
				$(".social_login").hide();
				$(".user_login").show();
				return false;
		});

		// Calling Register Form
		$("#register_form").click(function() {
				$(".social_login").hide();
				$(".user_register").show();
				$(".header_title").text('Register');
				return false;
		});

		// Going back to Social Forms
		$(".back_btn").click(function() {
				$(".user_login").hide();
				$(".user_register").hide();
				$(".social_login").show();
				$(".header_title").text('Login');
				return false;
		});
});

External CSS

  1. https://fonts.googleapis.com/css?family=Source+Sans+Pro:400,700,700italic,400italic
  2. https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.4.0/css/font-awesome.min.css

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js
  2. https://andwecode.com/wp-content/uploads/2015/10/jquery.leanModal.min_.js