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HTML

              
                <!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8"/>
	<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
	<meta http-equiv="X-UA-Compatible" content="ie-edge"/>
	<title>UI Project</title>
	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
	<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.8.1/css/all.css">
	<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
	<div class="container" id="container">
		<div class="form-container signup-container">
			<form action="#">
				<h1>Create Account</h1>
				<div class="social-container">
					<a href="#" class="social"><i class="fab fa-facebook-f"></i></a>
					<a href="#" class="social"><i class="fab fa-google-plus-g"></i></a>
					<a href="#" class="social"><i class="fab fa-linkedin-in"></i></a>
				</div>
				<span>or use your email to join us</span>
				<input type="text" placeholder="Name"/>
				<input type="text" placeholder="Email"/>
				<input type="text" placeholder="Password"/>
				<button>Sign Up</button>
			</form>
		</div> 
		<div class="form-container signin-container">
			<form action="#">
				<h1>Sign In</h1>
				<div class="social-container">
					<a href="#" class="social"><i class="fab fa-facebook-f"></i></a>
					<a href="#" class="social"><i class="fab fa-google-plus-g"></i></a>
					<a href="#" class="social"><i class="fab fa-linkedin-in"></i></a>
				</div>
				<span>or use your account</span>
				<input type="text" placeholder="Email"/>
				<input type="text" placeholder="Password"/>
				<a href="#" class="forgot">Forgot your Password</a>
				<button>Sign In</button>
			</form>
		</div>
		<div class="overlay-container">
			<div class="overlay">
				<div class="overlay-panel overlay-left">
					<h1>Welcome Back!</h1>
					<p>To keep connected with us please log in with your account</p>
					<button class="over-btn" id="signin">Sign In</button>
				</div>
				<div class="overlay-panel overlay-right">
					<h1>Hello, there</h1>
					<p>To join us please enter your personal details</p>
					<button class="over-btn" id="signup">Sign Up</button>
				</div>
			</div>
		</div>
	</div>
	<script src="script.js"></script>
</body>
</html>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Montserrat:400,800');

*
{
	box-sizing: border-box;
}
body
{
	font-family: 'Montserrat', sans-serif;
	background: #f6f5f7;
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	height: 100vh;
	margin: -20px 0 50px;
}
h1
{
	font-weight: bold;
	margin:0;
}

p{
	font-size: 14px;
	font-weight: 100;
	line-height: 20px;
	letter-spacing: 0.5px;
	margin: 20px 0 30px;
}
span{
	font-size: 12px;
}
a{
	color: #333;
	font-size: 14px;
	text-decoration: none;
	margin: 15px 0;
}
.container
{
	background: #fff;
	border-radius: 10px;
	box-shadow:  0 14px 28px rgba(0,0,0,0.25),0 10px 10px rgba(0,0,0,0.22);
	position: relative;
	overflow: hidden;
	width: 768px;
	max-width: 100%;
	min-height: 420px;
	min-width: 50%;

}

.form-container
{
	background: #fff;
	display: flex;
	flex-direction: column;
	padding: 0 50px;
	height: 100%;
	justify-content: center;
	align-items:center;
	text-align: center;
}
.social-container
{
	margin: 20px 0;
}
.social-container a{
	border: 1px solid #ddd;
	border-radius: 50%;
	display: inline-flex;
	justify-content:center;
	align-items: center;
	margin: 0 5px;
	height: 40px;
	width: 40px;
}
.form-container input{
	background:  #eee;
	border: none;
	padding: 12px 15px;
	margin: 8px 0;
	width: 100%;
}
.form-container button
{
	margin-top: 10px;
}

button
{
	border-radius: 20px;
	border: 1px solid #ffaa23;
	background: #ffaa23;
	color: #fff;
	font-size: 12px;
	font-weight: bold;
	padding:12px 45px;
	letter-spacing: 1px;
	text-transform: uppercase;
	transition: transform 80ms ease-in;

}
button:active{
	transform: scale(0.95);
}
button:focus
{
	outline: none;
}
button.over-btn
{
	background: transparent;
	border-color: #fff;
}
.social:hover
{
	color: #ffaa23;
	border-color: #ffaa23;
}
.form-container
{
	position: absolute;
	top: 0;
	height:  100%;
	transition:  0.6s ease-in-out;
}

.signin-container
{
	left:0;
	width: 50%;
	z-index:2;
}

.signup-container
{
	left:0;
	width: 50%;
	z-index:1;
	opacity: 0;
}
.signup-container button
{
	background: #ff782b;
	border-color: #ff782b;
}
.signup-container .social:hover
{
	color: #ff782b;
	border-color: #ff782b;
}
.signin-container button
{
	background: #ffa705;
	border-color: #ffa705;
}
.signin-container .forgot
{
  font-size: 12px;
  display: flex;
  flex-direction: column;
  margin-bottom: 0;
}
.overlay-container
{
	position: absolute;
	top=0;
	left: 50%;
	width: 50%;
	height: 100%;
	overflow: hidden;
	transition: transform 0.6s ease-in-out;
	z-index: 100;
}

.overlay
{
	background: #ffaa23;
	background: linear-gradient(to right, #ed2a31,#ffaa23) no-repeat 0 0 / cover;
	color: #fff;
	position: relative;
	left: -100%;
	height: 100%;
	width: 200%;
	transform: translateX(0);
	transition: transform 0.6s ease-in-out;
}
.overlay-panel
{
	position: absolute;
	top: 0;
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	padding: 0 40px;
	height: 100%;
	width: 50%;
	text-align: center;
	transform: translateX(0);
	transition:  transform 0.6s ease-in-out;
}
.overlay-right
{
	right: 0;
	transform: translateX(0);
}
.overlay-left
{
	transform: translateX(-20%);
}
.container.right-panel-active .signin-container
{
	transform: translateX(100%);
}
.container.right-panel-active .overlay-container
{
	transform: translateX(-100%);
}
.container.right-panel-active .signup-container
{
	transform: translateX(100%);
	opacity: 1;
	z-index: 5;
}
.container.right-panel-active .overlay
{
	transform: translateX(50%);
}

.container.right-panel-active .overlay-left
{
	transform: translateX(0);
}

.container.right-panel-active .overlay-right
{
	transform: translateX(20%);
}



              
            
!

JS

              
                const signUpbtn = document.getElementById('signup');
const signInbtn = document.getElementById('signin');
const container = document.getElementById('container');

signUpbtn.addEventListener('click',()=>{
	container.classList.add('right-panel-active')
});

signInbtn.addEventListener('click',()=>{
	container.classList.remove('right-panel-active')
});
              
            
!
999px

Console