style.css

body {
	margin: 0;
	padding: 0;
	display: flex;
	justify-content: center;
	align-items: center;
	min-height: 100vh;
	font-family: 'Jost', sans-serif;
	background: linear-gradient(to bottom, #0f0c29, #302b63, #24243e);
}


.main {
	width: 350px;
	height: 500px;
	background: red;
	overflow: hidden;
	background: url("https://doc-08-2c-docs.googleusercontent.com/docs/securesc/68c90smiglihng9534mvqmq1946dmis5/fo0picsp1nhiucmc0l25s29respgpr4j/1631524275000/03522360960922298374/03522360960922298374/1Sx0jhdpEpnNIydS4rnN4kHSJtU1EyWka?e=view&authuser=0&nonce=gcrocepgbb17m&user=03522360960922298374&hash=tfhgbs86ka6divo3llbvp93mg4csvb38") no-repeat center/ cover;
	border-radius: 10px;
	box-shadow: 5px 20px 50px #000;
}

#chk {
	display: none;
}

.signup {
	position: relative;
	width: 100%;
	height: 100%;
}

label {
	color: #fff;
	font-size: 2.3em;
	justify-content: center;
	display: flex;
	margin: 60px;
	font-weight: bold;
	cursor: pointer;
	transition: .5s ease-in-out;
}

input {
	width: 60%;
	height: 20px;
	background: #e0dede;
	justify-content: center;
	display: flex;
	margin: 20px auto;
	padding: 10px;
	border: none;
	outline: none;
	border-radius: 5px;
}

button {
	width: 60%;
	height: 40px;
	margin: 10px auto;
	justify-content: center;
	display: block;
	color: #fff;
	background: #573b8a;
	font-size: 1em;
	font-weight: bold;
	margin-top: 20px;
	outline: none;
	border: none;
	border-radius: 5px;
	transition: .2s ease-in;
	cursor: pointer;
}

button:hover {
	background: #6d44b8;
}

.login {
	height: 460px;
	background: #eee;
	border-radius: 60% / 10%;
	transform: translateY(-180px);
	transition: .8s ease-in-out;
}

.login label {
	color: #573b8a;
	transform: scale(.6);
}

#chk:checked~.login {
	transform: translateY(-500px);
}

#chk:checked~.login label {
	transform: scale(1);
}

#chk:checked~.signup label {
	transform: scale(.6);
}