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HTML

              
                <!DOCTYPE html>
<html lang="en">

<head>
    <title>SIGN UP SLIDER CONCEPT</title>
    <link rel="stylesheet" type="text/css" href="style.css">
    <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.8.1/css/all.css"
        integrity="sha384-50oBUHEmvpQ+1lW4y57PTFmhCaXp0ML5d60M1M7uH2+nqUivzIebhndOJK28anvf" crossorigin="anonymous">
    <script src="script.js"></script>

</head>

<!--main div-->
<div class="container" id="container">
    <div class="form-container sign-up-container">
        <!-- code for sign-up container goes here -->
        <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-twitter"></i></a>
                <a href="#" class="social"><i class="fab fa-linkedin-in"></i></a>
            </div>
            <span>or use your email for registration</span>
            <input type="text" placeholder="Name" />
            <input type="email" placeholder="Email" />
            <input type="password" placeholder="Password" />
            <button>Sign Up</button>
        </form>

    </div>
    <div class="form-container sign-in-container">
        <!-- code for form container sign goes here-->
        <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-twitter"></i></a>
                <a href="#" class="social"><i class="fab fa-linkedin-in"></i></a>
            </div>
            <span>or use your account</span>
            <input type="email" placeholder="Email" />
            <input type="password" placeholder="Password" />
            <a href="#">Forgot your password?</a>
            <button>Sign In</button>
        </form>

    </div>
    <div class="overlay-container">
        <!-- code for the overlay goes here-->
        <div class="overlay">
            <div class="overlay-panel overlay-left">
                <h1>Welcome Back!</h1>
                <p>
                    To keep connected with us please login with your personal info
                </p>
                <button class="ghost" id="signIn">Sign In</button>
            </div>
            <div class="overlay-panel overlay-right">
                <h1>Hello, Friend!</h1>
                <p>Enter your personal details and start your journey with us</p>
                <button class="ghost" id="signUp">Sign Up</button>
            </div>
        </div>

    </div>

</div>

</html>
              
            
!

CSS

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

* {
	box-sizing: border-box;
}

body {
    background-image: url('https://media.istockphoto.com/photos/triangular-abstract-background-picture-id624878906?k=6&m=624878906&s=612x612&w=0&h=uDcbe038RdtiiHchahAbwOYfx0bkPVLfsn0NOjA0gTM=');
    background-repeat: no-repeat;
	background-size: cover;
	display: flex;
	justify-content: center;
	align-items: center;
	flex-direction: column;
	font-family: 'Montserrat', sans-serif;
	height: 100vh;
	margin: -20px 0 50px;
}

h1 {
	font-weight: bold;
	margin: 0;
}

h2 {
	text-align: center;
}

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;
}

button {
	border-radius: 20px;
	border: 1px solid #FF4B2B;
	background-color: #FF4B2B;
	color: #FFFFFF;
	font-size: 12px;
	font-weight: bold;
    padding: 12px 45px;
    -moz-border-radius: 4px;
    -webkit-border-radius: 4px;
    border-radius: 12px ;
	letter-spacing: 1px;
	text-transform: uppercase;
	transition: transform 80ms ease-in;
}

button:active {
	transform: scale(0.95);
}

button:focus {
	outline: none;
}

button.ghost {
	background-color: transparent;
	border-color: #FFFFFF;
}

form {
	background-color: #FFFFFF;
	display: flex;
	align-items: center;
	justify-content: center;
	flex-direction: column;
	padding: 0 50px;
	height: 100%;
	text-align: center;
}

input {
	background-color: #eee;
	border: none;
	padding: 12px 15px;
	margin: 8px 0;
	width: 100%;
}

.container {
	background-color: #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: 480px;
}

.form-container {
	position: absolute;
	top: 0;
	height: 100%;
	transition: all 0.6s ease-in-out;
}

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

.container.right-panel-active .sign-in-container {
	transform: translateX(100%);
}

.sign-up-container {
	left: 0;
	width: 50%;
	opacity: 0;
	z-index: 1;
}

.container.right-panel-active .sign-up-container {
	transform: translateX(100%);
	opacity: 1;
	z-index: 5;
	animation: show 0.6s;
}

@keyframes show {
	0%, 49.99% {
		opacity: 0;
		z-index: 1;
	}
	
	50%, 100% {
		opacity: 1;
		z-index: 5;
	}
}

.overlay-container {
	position: absolute;
	top: 0;
	left: 50%;
	width: 50%;
	height: 100%;
	overflow: hidden;
	transition: transform 0.6s ease-in-out;
	z-index: 100;
}

.container.right-panel-active .overlay-container{
	transform: translateX(-100%);
}

.overlay {
    background: #e1eec3;  /* fallback for old browsers */
    background: -webkit-linear-gradient(to bottom, #f05053, #e1eec3);  /* Chrome 10-25, Safari 5.1-6 */
    background: linear-gradient(to bottom, #f05053, #e1eec3); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
    

	background-repeat: no-repeat;
	background-size: cover;
	background-position: 0 0;
	color: #FFFFFF;
	position: relative;
	left: -100%;
	height: 100%;
	width: 200%;
  	transform: translateX(0);
	transition: transform 0.6s ease-in-out;
}

.container.right-panel-active .overlay {
  	transform: translateX(50%);
}

.overlay-panel {
	position: absolute;
	display: flex;
	align-items: center;
	justify-content: center;
	flex-direction: column;
	padding: 0 40px;
	text-align: center;
	top: 0;
	height: 100%;
	width: 50%;
	transform: translateX(0);
	transition: transform 0.6s ease-in-out;
}

.overlay-left {
	transform: translateX(-20%);
}

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

.overlay-right {
	right: 0;
	transform: translateX(0);
}

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

.social-container {
	margin: 20px 0;
}

.social-container a {
	border: 1px solid #DDDDDD;
	border-radius: 50%;
	display: inline-flex;
	justify-content: center;
	align-items: center;
	margin: 0 5px;
	height: 40px;
	width: 40px;
}


              
            
!

JS

              
                const signUpButton = document.getElementById('signUp');
const signInButton = document.getElementById('signIn');
const container = document.getElementById('container');

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

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

Console