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HTML

<!DOCTYPE html>
<html lang="es">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Andev web - Validar formulario</title>
    <link rel="stylesheet" href="style.css" />
    <link
      rel="stylesheet"
      href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css"
      integrity="sha512-iecdLmaskl7CVkqkXNQ/ZH/XLlvWZOJyj7Yy7tcenmpD1ypASozpmT/E0iPtmFIB46ZmdtAc9eNBvH0H/ZpiBw=="
      crossorigin="anonymous"
      referrerpolicy="no-referrer"
    />
  </head>
  <body>
    <div class="container" id="container">
      <div class="form-container register-container">
        <form>
          <h1>Regístrate aquí</h1>
          <div class="form-control">
            <input type="text" id="username" placeholder="Nombre" />
            <small id="username-error"></small>
            <span></span>
          </div>
          <div class="form-control">
            <input type="email" id="email" placeholder="Correo electrónico" />
            <small id="email-error"></small>
            <span></span>
          </div>
          <div class="form-control">
            <input type="password" id="password" placeholder="Contraseña" />
            <small id="password-error"></small>
            <span></span>
          </div>
          <button type="submit" value="submit">Registrar</button>
          <span>o usa tu cuenta</span>
          <div class="social-container">
            <a href="#" class="social"
              ><i class="fa-brands fa-facebook-f"></i
            ></a>
            <a href="#" class="social"><i class="fa-brands fa-google"></i></a>
            <a href="#" class="social"><i class="fa-brands fa-tiktok"></i></a>
          </div>
        </form>
      </div>

<div class="form-container login-container">
        <form class="form-lg">
          <h1>Inicia sesión aquí</h1>
          <div class="form-control2">
            <input type="email" class="email-2" placeholder="Correo electrónico" />
            <small class="email-error-2"></small>
            <span></span>
          </div>
          <div class="form-control2">
            <input type="password" class="password-2" placeholder="Contraseña" />
            <small class="password-error-2"></small>
            <span></span>
          </div>

<div class="content">
            <div class="checkbox">
              <input type="checkbox" name="checkbox" id="checkbox" />
              <label for="">Recuérdame</label>
            </div>
            <div class="pass-link">
              <a href="#">¿Olvidaste la contraseña?</a>
            </div>
          </div>
          <button type="submit" value="submit">Iniciar sesión</button>
          <span>O usa tu cuenta</span>
          <div class="social-container">
            <a href="#" class="social"
              ><i class="fa-brands fa-facebook-f"></i
            ></a>
            <a href="#" class "social"><i class="fa-brands fa-google"></i></a>
            <a href="#" class="social"><i class="fa-brands fa-tiktok"></i></a>
          </div>
        </form>
      </div>

<div class="overlay-container">
        <div class="overlay">
          <div class="overlay-panel overlay-left">
            <h1 class="title">
              Hola <br />
              amigos
            </h1>
            <p>Si tienes una cuenta, inicia sesión aquí y diviértete</p>
            <button class="ghost" id="login">
              Iniciar sesión
              <i class="fa-solid fa-arrow-left"></i>
            </button>
          </div>

<div class="overlay-panel overlay-right">
            <h1 class="title">
              Comienza tu <br />
              viaje ahora
            </h1>
            <p>
              Si aún no tienes una cuenta, únete a nosotros y comienza tu viaje
            </p>
            <button class="ghost" id="register">
              Registrarse
              <i class="fa-solid fa-arrow-right"></i>
            </button>
          </div>
        </div>
      </div>
    </div>
  </body>
  <script src="main.js"></script>
</html>

CSS

@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@100;200;300;400;500;600;700;800;900&display=swap");

* {
  /* margin: 0;
    padding: 0; */
  box-sizing: border-box;
}

body {
  background-color: #686c78;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  font-family: "Poppins", sans-serif;
  overflow: hidden;
  height: 100vh;
}

h1 {
  font-weight: 700;
  letter-spacing: -1.5px;
  margin: 0;
  margin-bottom: 15px;
}

h1.title {
  font-size: 45px;
  line-height: 45px;
  margin: 0;
  text-shadow: 0 0 10px rgba(16, 64, 74, 0.5);
}

p {
  font-size: 15px;
  font-weight: 400;
  line-height: 20px;
  letter-spacing: 0.5px;
  margin: 20px 0 30px;
  text-shadow: 0 0 10px rgba(16, 64, 74, 0.5);
}

span {
  font-size: 14px;
  margin-top: 20px;
}

a {
  color: #333;
  font-size: 14px;
  text-decoration: none;
  margin: 15px 0;
  transition: 0.3s ease-in-out;
}

a:hover {
  color: #4bb6b7;
}

.content {
  display: flex;
  width: 100%;
  height: 50px;
  align-items: center;
  justify-content: space-around;
}

.content .checkbox {
  display: flex;
  align-items: center;
  justify-content: center;
}

.content input {
  accent-color: #333;
  width: 12px;
  height: 12px;
}

.content label {
  font-size: 14px;
  user-select: none;
  padding: 5px;
}

button {
  position: relative;
  border-radius: 20px;
  border: 1px solid #686c78;
  background-color: #686c78;
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  margin: 20px;
  padding: 12px 80px;
  letter-spacing: 1px;
  text-transform: capitalize;
  transition: 0.3s ease-in-out;
  cursor: pointer;
}

button:hover {
  letter-spacing: 3px;
}

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

button:focus {
  outline: none;
}

button.ghost {
  background-color: rgba(255, 255, 255, 0.2);
  border: 2px solid #fff;
  color: #fff;
}

#login i {
  position: absolute;
  left: 50px;
}

#register i {
  position: absolute;
  right: 50px;
}

button.ghost i {
  position: absolute;
  opacity: 1;
  transition: 0.3s ease-in-out;
  z-index: 6;
}

button.ghost i.register {
  right: 70px;
}

button.ghost i.login {
  left: 70px;
}

form {
  background-color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 0 50px;
  height: 100%;
  text-align: center;
}

input {
  background-color: #fff;
  outline: none;
  border: none;
  border-bottom: 2px solid #adadad;
  padding: 12px 0px;
  margin: 8px 0;
  width: 100%;
}

.container {
  border-radius: 25px;
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.25), 0 0px 10px rgba(0, 0, 0, 0.22);
  position: relative;
  overflow: hidden;
  width: 768px;
  max-width: 100%;
  min-height: 500px;
}

.form-container {
  position: absolute;
  top: 0;
  height: 100%;
  transition: all 0.6s ease-in-out;
}

.form-control {
  width: 100%;
  position: relative;
}

.form-control2 {
  width: 100%;
  position: relative;
}

.form-control2 span {
  position: absolute;
  border-bottom: 3px solid #2691d9;
  left: 0;
  bottom: 8px;
  width: 0%;
  transition: all 0.3s ease;
}

.form-control2 input:focus ~ span {
  width: 100%;
}
.form-control small {
  color: red;
  position: absolute;
  top: 50px;
  left: 0;
  font-size: 12px;
  z-index: 100;
}

.form-control span {
  position: absolute;
  border-bottom: 3px solid #2691d9;
  left: 0;
  bottom: 8px;
  width: 0%;
  transition: all 0.3s ease;
}

.form-control input:focus ~ span {
  width: 100%;
}

.form-control2 small {
  color: red;
  position: absolute;
  top: 50px;
  left: 0;
  font-size: 12px;
  z-index: 100;
}

.form-control2 span {
  position: absolute;
  border-bottom: 3px solid #2691d9;
  left: 0;
  bottom: 8px;
  width: 0%;
  transition: all 0.3s ease;
}

.form-control2 input:focus ~ span {
  width: 100%;
}

.login-container {
  left: 0;
  width: 50%;
  z-index: 2;
}

.container.right-panel-active .login-container {
  transform: translateX(100%);
}

.register-container {
  /* position: relative; */
  left: 0;
  width: 50%;
  opacity: 0;
  z-index: 1;
}

.container.right-panel-active .register-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: translate(-100%);
}

.overlay {
  background-image: url("https://images.unsplash.com/photo-1621360841013-c7683c659ec6?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1932&q=80");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: 0 0;
  color: #fff;
  position: relative;
  left: -100%;
  height: 100%;
  width: 200%;
  transform: translateX(0);
  transition: transform 0.6s ease-in-out;
}

.overlay::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  background: linear-gradient(
    to top,
    rgba(46, 94, 109, 0.4) 40%,
    rgba(46, 94, 109, 0)
  );
}

.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;
  transition: 0.3s ease-in-out;
}

.social-container a:hover {
  border: 1px solid #4bb6b7;
}

// Animations
const registerButton = document.getElementById("register");
const loginButton = document.getElementById("login");
const container = document.getElementById("container");

registerButton.addEventListener("click", () => {
  container.classList.add("right-panel-active");
});

loginButton.addEventListener("click", () => {
  container.classList.remove("right-panel-active");
});

// Check Register Error
const form = document.querySelector('form')
const username = document.getElementById('username')
const usernameError = document.querySelector("#username-error")
const email = document.getElementById('email')
const emailError = document.querySelector("#email-error")
const password = document.getElementById('password')
const passwordError = document.querySelector("#password-error")

// Show input error message
function showError(input, message) {
    const formControl = input.parentElement
    formControl.className = 'form-control error'
    const small = formControl.querySelector('small')
    small.innerText = message
}

// Show success outline
function showSuccess(input) {
    const formControl = input.parentElement
    formControl.className = 'form-control success'
    const small = formControl.querySelector('small')
    small.innerText = ''
}

// Check email is valid
function checkEmail(email) {
    const emailRegex = /^\w+([.-]?\w+)*@\w+([.-]?\w+)*(\.\w{2,3})+$/;
    return emailRegex.test(email);
}

email.addEventListener("input", function(){
    if (!checkEmail(email.value)) {
        emailError.textContent = "*Email is not valid"
    }else {
        emailError.textContent = "";
    }
})

// Check length input user name
username.addEventListener("input", function(){
    if (username.value.length < 4) {
        usernameError.textContent = "*Username must be at least 8 characters."
    }else if(username.value.length > 20){
        usernameError.textContent = "*Username must be less than 20 characters.";
    }else {
        usernameError.textContent = "";
    }
})

// Check length input password
password.addEventListener("input", function(){
    if (password.value.length < 8) {
        passwordError.textContent = "*Password must be at least 8 characters."
    }else if(password.value.length > 20){
        passwordError.textContent = "*Password must be less than 20 characters."
    }else {
        passwordError.textContent = "";
    }
})

// Check required fields
function checkRequired(inputArr) {
    let isRequired = false
    inputArr.forEach(function(input) {
        if (input.value.trim() === '') {
            showError(input, `*${getFieldName(input)} is required`)
            isRequired = true
        }else {
            showSuccess(input)
        }
    })

return isRequired
}

// Get fieldname
function getFieldName(input) {
    return input.id.charAt(0).toUpperCase() + input.id.slice(1)
}

// Event listeners
form.addEventListener('submit', function (e) {
    e.preventDefault()

if (!checkRequired([username, email, password])) {
        // checkLength(username, 3, 15)
        // checkLength(password, 6, 25)
        // checkEmail(email)
    } 
})

// Check Login Error

let lgForm = document.querySelector('.form-lg')
let lgEmail = document.querySelector('.email-2')
let lgEmailError = document.querySelector(".email-error-2")
let lgPassword = document.querySelector('.password-2')
let lgPasswordError = document.querySelector(".password-error-2")

function showError2(input, message) {
    const formControl2 = input.parentElement
    formControl2.className = 'form-control2 error'
    const small2 = formControl2.querySelector('small')
    small2.innerText = message
}

function showSuccess2(input) {
    const formControl2 = input.parentElement
    formControl2.className = 'form-control2 success'
    const small2 = formControl2.querySelector('small')
    small2.innerText = '';
}

// Check email is valid
function checkEmail2(lgEmail) {
    const emailRegex2 = /^\w+([.-]?\w+)*@\w+([.-]?\w+)*(\.\w{2,3})+$/;
    return emailRegex2.test(lgEmail);
}

lgEmail.addEventListener("input", function(){
    if (!checkEmail2(lgEmail.value)) {
        lgEmailError.textContent = "*Email is not valid"
    }else {
        lgEmailError.textContent = "";
    }
})

// Check length input passwrod
lgPassword.addEventListener("input", function(){
    if (lgPassword.value.length < 8) {
        lgPasswordError.textContent = "*Password must be at least 8 characters."
    }else if (lgPassword.value.length > 20){
        lgPasswordError.textContent = "*Password must be less than 20 characters."
    }else {
        lgPasswordError.textContent = "";
    }
})

function checkRequiredLg(inputArr2) {
    let isRequiredLg = false
    inputArr2.forEach(function(input){
        if (input.value.trim() === '') {
            showError2(input, `*${getFieldNameLg(input)} Please enter your information in this field`)
            isRequiredLg = true
        }else {
            showSuccess2(input)
        }
    })

return isRequiredLg
}

function getFieldNameLg(input) {
    return input.id.charAt(0).toUpperCase() + input.id.slice(1)
}

lgForm.addEventListener('submit', function (e){
    e.preventDefault()

if (!checkRequiredLg([lgEmail, lgPassword])) {
        checkEmail2(lgEmail)
    }
})