body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: Arial, sans-serif;
    background: #f5f5f5;
}

.login-container {
    width: 90%;
    max-width: 400px;
    padding: 30px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 0 15px rgba(0,0,0,.15);
}

    .login-container h2 {
        text-align: center;
        margin-bottom: 25px;
    }

input {
    width: 100%;
    box-sizing: border-box;
    margin-bottom: 12px;
    padding: 14px;
    font-size: 16px;
}

button {
    width: 100%;
    padding: 14px;
    font-size: 16px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

.error {
    color: red;
    text-align: center;
}