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, #fff5ee, whitesmoke, #fff5ee);
}

main {
  width: 350px;
  height: 500px;
  background: red;
  overflow: hidden;
  background-color: #3c3c3c;
  border-radius: 10px;
  box-shadow: 5px 20px 50px #000;
}

#chk {
  display: none;
}

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

main label {
  color: #fff;
  font-size: 2.3em;
  justify-content: center;
  display: flex;
  margin: 50px;
  font-weight: bold;
  cursor: pointer;
  transition: 0.5s ease-in-out;
}

main input {
  width: 60%;
  height: 10px;
  background: #e0dede;
  justify-content: center;
  display: flex;
  margin: 20px auto;
  padding: 12px;
  border: none;
  outline: none;
  border-radius: 5px;
}

main button {
  width: 60%;
  height: 40px;
  margin: 10px auto;
  justify-content: center;
  display: block;
  background-color: #3c3c3c;
  color: whitesmoke;
  font-size: 1em;
  font-weight: bold;
  margin-top: 30px;
  outline: none;
  border: none;
  border-radius: 5px;
  transition: 0.2s ease-in;
  cursor: pointer;
}

main button:hover {
  background-color: whitesmoke;
  color: #3c3c3c;
}

.login {
  height: 460px;
  background: #eee;
  border-radius: 60% / 10%;
  transform: translateY(-180px);
  transition: 0.8s ease-in-out;
}

.login label {
  color: #3c3c3c;
  transform: scale(0.6);
}

.login input,
.login button {
  display: none;
}

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

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

#chk:checked ~ .login input {
  display: flex;
}

#chk:checked ~ .login button {
  display: block;
}

#chk:checked ~ .signup label {
  transform: scale(0.6);
}

#chk:checked ~ .signup input,
#chk:checked ~ .signup button {
  display: none;
}