body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
}

header {
    background-color: #333;
    color: white;
    padding: 1rem;
    text-align: center;
}

h1 {
    margin-top: 1rem;
    text-align: center;
}

table {
    width: 80%;
    margin: 0 auto;
    border-collapse: collapse;
}

table, th, td {
    border: 1px solid #ddd;
    padding: 0.5rem;
    text-align: left;
}

th {
    background-color: #333;
    color: white;
}

form {
    margin-top: 1rem;
    text-align: center;
}

form label {
    display: block;
    margin-bottom: 10px;
}

form input[type="text"],
form input[type="password"] {
    width: 50%;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 3px;
    box-sizing: border-box;
    text-align: center;
}

form input[type="submit"] {
    width: 25%;
    padding: 10px;
    margin-top: 10px;
    background-color: #4caf50;
    color: white;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

form input[type="submit"]:hover {
    background-color: #45a049;
}

span.error-message {
    color: red;
    font-size: 14px;
}