body {
    background: linear-gradient(135deg, #667eea, #764ba2);
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: Arial, sans-serif;
}

.login-box {
    background: #fff;
    padding: 30px;
    width: 320px;
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(0,0,0,.2);
    text-align: center;
}

.login-box h2 {
    margin-bottom: 20px;
}

.login-box input {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border-radius: 5px;
    border: 1px solid #ddd;
}

.login-box button {
    width: 100%;
    padding: 10px;
    background: #667eea;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.login-box button:hover {
    background: #5a67d8;
}

#message {
    margin-top: 15px;
    font-size: 14px;
}

@media (max-width: 480px) {
    .login-box {
        width: 90%;
        padding: 20px;
    }

    .login-box h2 {
        font-size: 20px;
    }

    .login-box input,
    .login-box button {
        font-size: 14px;
    }
}