cssのtransformについて

Question

取り組んでいること

SignUpとSignInのコードを書いています

環境

"react": "^16.8.6",

現在のコード

//App.js
import Reactfrom 'react'
import Signin from './Signin'

library.add(fab, faGoogle, faCoffee)

const App = () => {
  const [state, dispatch] = useReducer(reducer, [])

  return (
    <React.Fragment>
      <Signin />
    </React.Fragment>
  )
}

export default App

//Signin.js
import React, { useState } from 'react'
import './index.css'

const Signin = () => {
  const [hidden, setHidden] = useState(true)

  return (
    <div className="container" id="container">
      <div className="form-container sign-in-container" id="signinScreen">
        <form action="#">
          <h1>Sign in</h1>
          <div className="social-container">
            <a href="#" class="social">
              <i className="fab fa-facebook-f"></i>
            </a>
            <a href="#" class="social">
              <i className="fab fa-google-plus-g"></i>
            </a>
            <a href="#" class="social">
              <i className="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 className="form-container sign-up-container" id="signupScreen">
        <form action="#">
          <h1>Create Account</h1>
          <div className="social-container">
            <a href="#" className="social">
              <i className="fab fa-facebook-f"></i>
            </a>
            <a href="#" class="social">
              <i className="fab fa-google-plus-g"></i>
            </a>
            <a href="#" class="social">
              <i className="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 className="overlay-container">
        <div className="overlay">
          <div className="overlay-panel overlay-left">
            <h1>Welcome Back!</h1>
            <p>
              To keep connected with us please login with your personal info
            </p>
            <button className="ghost" id="signIn">
              Sign In
            </button>
          </div>
          <div className="overlay-panel overlay-right">
            <h1>Hello, Friend!</h1>
            <p>Enter your personal details and start journey with us</p>
            <button className="ghost" id="signUp" onClick={toSignInScreen}>
              Sign Up
            </button>
          </div>
        </div>
      </div>
    </div>
  )
}

export default Signin

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

* {
  box-sizing: border-box;
}

body {
  background: #f6f5f7;
  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;
  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: #ff416c;
  background: -webkit-linear-gradient(to right, #ff4b2b, #ff416c);
  background: linear-gradient(to right, #ff4b2b, #ff416c);
  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;
}

footer {
  background-color: #222;
  color: #fff;
  font-size: 14px;
  bottom: 0;
  position: fixed;
  left: 0;
  right: 0;
  text-align: center;
  z-index: 999;
}

footer p {
  margin: 10px 0;
}

footer i {
  color: red;
}

footer a {
  color: #3c97bf;
  text-decoration: none;
}

実現したいこと

参考リンク
参考リンクのようにSignInボタン，SignUpボタンを押すことで画面の表示を切り替えたい．

問題

SignUpボタンを押すことで，right-panel-activeというcssクラスが追加されます．
SignUpボタンが押されたと仮定して，下記のようにしたところ，表示がかぶってしまいます．

<div className="container right-panel-active" id="container">

どのようにすれば，画面がきちんと分割されるでしょうか？