body {
    font-family: sans-serif;
    background: #f0f2f5;
    margin: 0;
    padding: 0;
}

.login-box {
    max-width: 400px;
    margin: 5em auto;
    background: #fff;
    padding: 2em;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.login-box h2 {
    text-align: center;
    margin-bottom: 1em;
}

.login-box input {
    width: 100%;
    padding: 0.7em;
    margin: 0.5em 0;
    box-sizing: border-box;
}

.login-box button {
    width: 100%;
    padding: 0.7em;
    background: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.login-box button:hover {
    background: #45a049;
}

.error {
    color: red;
    margin-top: 1em;
    text-align: center;
}