body {
    font-family: Arial;
    background: #f4f4f4;
}

.login-box {
    width: 300px;
    margin: 100px auto;
    padding: 20px;
    background: #fff;
    border-radius: 8px;
    text-align: center;
}

input {
    width: 90%;
    padding: 10px;
    margin: 10px 0;
}

button {
    padding: 10px 20px;
    background: #333;
    color: #fff;
    border: none;
}

.error {
    color: red;
}