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HTML

<!DOCTYPE html>
<html lang="en" >
<head>
  <meta charset="UTF-8">
  <title>Login/Register</title>
  <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover"><link rel="stylesheet" href="./style.css">
<link rel="stylesheet" href="/css/styles.css">
</head>
<body>
	<section class="forms-section">
		<div class="forms">
		  <div class="form-wrapper is-active">
			<button type="button" class="switcher switcher-login">
			  Login
			  <span class="underline"></span>
			</button>
			<form class="form form-login">
			  <fieldset>
				<legend>Please, enter your email and password for login.</legend>
				<div class="input-block">
				  <label>E-mail</label>
				  <input id="login-email" type="email" required>
				</div>
				<div class="input-block">
				  <label>Password</label>
				  <input id="login-password" type="password" required>
				</div>
			  </fieldset>
			  <button type="submit" class="btn">Login</button>
			</form>
		  </div>
		  <div class="form-wrapper">
			<button type="button" class="switcher switcher-signup">
			  Sign Up
			  <span class="underline"></span>
			</button>
			<form class="form form-signup">
			  <fieldset>
				<legend>Please, enter your email, password and password confirmation for sign up.</legend>
				<div class="input-block">
				  <label>E-mail</label>
				  <input id="signup-email" type="email" required>
				</div>
				<div class="input-block">
				  <label>Password</label>
				  <input id="signup-password" type="password" required>
				</div>
				<div class="input-block">
				  <label for="signup-password-confirm">Confirm password</label>
				  <input id="signup-password-confirm" type="password" required>
				</div>
			  </fieldset>
			  <button type="submit" class="btn">Continue</button>
			</form>
		  </div>
		</div>
	  </section>
	  <script src="/js/main.js"></script>
</body>
</html>

CSS

*,
*::before,
*::after {
	box-sizing: border-box;
}

body {
	font-family: 'Poppins', sans-serif;
	color: #ffeba7;
	background-color: #1f2029;
	overflow: hidden;
	height: 100vh;
	display: flex;
	justify-content: center;
	align-items: center;
	background: radial-gradient(ellipse at bottom, #1B2735 0%, #12141d 100%);
}

.forms-section {
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
}
.forms {
	display: flex;
	align-items: flex-start;
	margin-top: 30px;
}

.form-wrapper {
	animation: hideLayer .3s ease-out forwards;
}

.form-wrapper.is-active {
	animation: showLayer .3s ease-in forwards;
}

@keyframes showLayer {
	50% {
		z-index: 1;
	}

100% {
		z-index: 1;
	}
}

@keyframes hideLayer {
	0% {
		z-index: 1;
	}

49.999% {
		z-index: 1;
	}
}

.switcher {
	position: relative;
	cursor: pointer;
	display: block;
	margin-right: auto;
	margin-left: auto;
	padding: 0;
	text-transform: uppercase;
	font-family: inherit;
	font-size: 16px;
	letter-spacing: .5px;
	color: #999;
	background-color: transparent;
	border: none;
	outline: none;
	transform: translateX(0);
	transition: all .3s ease-out;
}

.form-wrapper.is-active .switcher-login {
	color: #fff;
	transform: translateX(90px);
}

.form-wrapper.is-active .switcher-signup {
	color: #fff;
	transform: translateX(-90px);
}
.form {
	overflow: hidden;
	min-width: 260px;
	margin-top: 50px;
	padding: 30px 25px;
	border-radius: 5px;
	transform-origin: top;
}

.form-login {
	animation: hideLogin .3s ease-out forwards;
}

.form-wrapper.is-active .form-login {
	animation: showLogin .3s ease-in forwards;
}

@keyframes showLogin {
	0% {
		background: #d7e7f1;
		transform: translate(40%, 10px);
	}

50% {
		transform: translate(0, 0);
	}

100% {
		background-color: #fff;
		transform: translate(35%, -20px);
	}
}

@keyframes hideLogin {
	0% {
		background-color: #fff;
		transform: translate(35%, -20px);
	}

50% {
		transform: translate(0, 0);
	}

100% {
		background: #d7e7f1;
		transform: translate(40%, 10px);
	}
}

.form-signup {
	animation: hideSignup .3s ease-out forwards;
}

.form-wrapper.is-active .form-signup {
	animation: showSignup .3s ease-in forwards;
}

@keyframes showSignup {
	0% {
		background: #d7e7f1;
		transform: translate(-40%, 10px) scaleY(.8);
	}

50% {
		transform: translate(0, 0) scaleY(.8);
	}

100% {
		background-color: #fff;
		transform: translate(-35%, -20px) scaleY(1);
	}
}

@keyframes hideSignup {
	0% {
		background-color: #fff;
		transform: translate(-35%, -20px) scaleY(1);
	}

50% {
		transform: translate(0, 0) scaleY(.8);
	}

100% {
		background: #d7e7f1;
		transform: translate(-40%, 10px) scaleY(.8);
	}
}

.form fieldset {
	position: relative;
	opacity: 0;
	margin: 0;
	padding: 0;
	border: 0;
	transition: all .3s ease-out;
}

.form-login fieldset {
	transform: translateX(-50%);
}

.form-signup fieldset {
	transform: translateX(50%);
}

.form-wrapper.is-active fieldset {
	opacity: 1;
	transform: translateX(0);
	transition: opacity .4s ease-in, transform .35s ease-in;
}

.form legend {
	position: absolute;
	overflow: hidden;
	width: 1px;
	height: 1px;
	clip: rect(0 0 0 0);
}

.input-block {
	margin-bottom: 20px;
}

.input-block label {
	font-size: 14px;
	color: #a1b4b4;
}

.input-block input {
	display: block;
	width: 100%;
	margin-top: 8px;
	padding-right: 15px;
	padding-left: 15px;
	font-size: 16px;
	line-height: 40px;
	color: #3b4465;
	background: #eef9fe;
	border: 1px solid #cddbef;
	border-radius: 2px;
}

.btn {
	opacity: 0;
	display: block;
	min-width: 280px;
	margin: 30px auto 10px;
	font-size: 18px;
	line-height: 40px;
	border-radius: 10px;
	border: none;
	cursor: pointer;
	transition: all .3s ease-out;
	color: #a7e245;
	background: #fbfdff;
	box-shadow: inset 0 0 0 2px #a7e245;
	transform: translateX(30%);
}

.form-wrapper.is-active .form [type='submit'] {
	opacity: 1;
	transform: translateX(0);
	transition: all .4s ease-in;
}

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