body {
    font-family: Arial, sans-serif;
    background: #f5f7fa;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
}
.login-box {
    background: #fff;
    padding: 40px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    border-radius: 8px;
    width: 300px;
}
h1 {
    text-align: center;
    margin-bottom: 20px;
    font-size: 24px;
}
label {
    display: block;
    margin-top: 10px;
    font-weight: bold;
}
input[type=text], input[type=password] {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 4px;
}
input[type=submit] {
    width: 100%;
    padding: 10px;
    margin-top: 20px;
    background: #0069d9;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}
input[type=submit]:hover {
    background: #0053ba;
}
.error {
    color: red;
    text-align: center;
}