ボタンを押してスクロールせず、画面が表示されない

Login画面を作成しています。 create account画面で、『 GO TO REGISTER』を押したら、 スクロール後、sign in画面が表示されるようにしたいです。

現在、create account画面で、『 GO TO REGISTER』を押したら、 スクロールせず、sign in画面が表示されず真っ白な状態で表示されます。

検証ツールで確認しても、エラー表示がありません。 何方かアドバイスをお願いします。

import React, { useState } from "react";
import "./LoginRegister.css";

const LoginRegister = () => {
  const [addclass, setaddclass] = useState("");
  return (
    <div className={`container ${addclass}`} id="container">
      <div className="form-container sign-up-container">
        <form>
          <h1>Create Account</h1>
          <input type="text" placeholder="Name" />
          <input type="email" placeholder="Email" />
          <input type="password" placeholder="Password" />
          <button type="submit">REGISTER</button>
        </form>
      </div>
      <div className="form-container sign-in-container">
        <form>
          <h1>Login</h1>
          <input type="email" placeholder="Email" />
          <input type="password" placeholder="Password" />
          <button type="submit">LOGIN</button>
        </form>
      </div>
      <div className="overlay-container">
        <div className="overlay">
          <div className="overlay-panel overlay-left">
            <button
              className="ghost"
              id="signIn"
              onClick={() => setaddclass("")}
            >
              GO TO LOGIN
            </button>
          </div>
          <div className="overlay-panel overlay-right">
            <button
              className="ghost"
              id="signUp"
              onClick={() => setaddclass("right-panel-active")}
            >
              GO TO REGISTER
            </button>
          </div>
        </div>
      </div>
    </div>
  );
};
export default LoginRegister;

* {
  box-sizing: border-box;
}

body {
  background-color: black;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  height: 100vh;
  margin: -20px 0 50px;
}

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

button {
  border-radius: 15px;
  border: 2px solid white;
  background-color: green;
  color: #ffffff;
  font-size: 14px;
  font-weight: bold;
  padding: 14px 45px;
  letter-spacing: 1px;
  text-transform: uppercase;
  transition: transform 80ms ease-in;
}

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

button:focus {
  outline-color: #ffffff;
}

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: #ffffff;
  border: 2px solid #0a0;
  padding: 12px 15px;
  margin: 10px 0;
  width: 100%;
}

.container {
  background-color: #ffffff;
  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: 1;
  z-index: 5;
}

.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: yellowgreen;
  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%);
}