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HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Login and Signup</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <div class="container">
        <div class="form-container">
            <div class="button-box">
                <button id="loginBtn" class="toggle-btn" onclick="showLogin()">Login</button>
                <button id="signupBtn" class="toggle-btn" onclick="showSignup()">Signup</button>
            </div>
            <form id="loginForm" class="form" action="#" method="POST">
                <h2>Login</h2>
                <input type="text" placeholder="Username" required>
                <input type="password" placeholder="Password" required>
                <button type="submit" class="submit-btn">Login</button>
            </form>
            <form id="signupForm" class="form" action="#" method="POST">
                <h2>Signup</h2>
                <input type="text" placeholder="Username" required>
                <input type="email" placeholder="Email" required>
                <input type="password" placeholder="Password" required>
                <button type="submit" class="submit-btn">Signup</button>
            </form>
        </div>
    </div>

CSS

/* Replace with your CSS Code 
(Leave empty if not needed) */                                           
* {

margin: 0;

padding: 0;

box-sizing: border-box;

}

body {

font-family: Arial, sans-serif;

background-color: white;

display: flex;

justify-content: center;

align-items: center;

height: 100vh;

}

.container {

width: 300px;

background-color: white;

padding: 20px;

border-radius: 10px;

box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);

position: relative;

overflow: hidden;

}

.form-container {

position: relative;

}

.form {

display: none;

animation: slide-in 0.5s ease;

}

.form h2 {

color: orange;

margin-bottom: 10px;

}

input {

width: 100%;

padding: 10px;

margin: 10px 0;

border: 1px solid orange;

border-radius: 5px;

}

button {

width: 100%;

padding: 10px;

border: none;

background-color: orange;

color: white;

border-radius: 5px;

cursor: pointer;

}

button:hover {

background-color: darkorange;

}

.button-box {

display: flex;

justify-content: space-between;

margin-bottom: 10px;

}

.toggle-btn {

background-color: white;

border: 1px solid orange;

padding: 10px;

cursor: pointer;

transition: background-color 0.3s;

}

.toggle-btn:hover {

background-color: orange;

color: white;

}

@keyframes slide-in {

from { opacity: 0; transform: translateX(100%); }

to { opacity: 1; transform: translateX(0); }

}