body {
    font-family: Arial, sans-serif;
    background: #f0f0f0;
    display: flex;
    height: 100vh;
    justify-content: center;
    align-items: center;
}

* {
    box-sizing:border-box;
}
.login-container {
    background: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 0 15px rgba(0,0,0,0.2);
    width: 300px;
}
.login-container h2 {
    margin-bottom: 20px;
}
.login-container input {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
}
.login-container button {
    width: 100%;
    padding: 10px;
    background: #4CAF50;
    color: #fff;
    border: none;
}
.error {
    color: red;
    margin-bottom: 10px;
}