* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    color: #333;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background-color: #007BFF;
    padding: 20px;
    color: white;
    text-align: center;
}

header h1 {
    margin: 0;
}

button {
    background-color: #28a745;
    color: white;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    margin-top: 10px;
}

button:hover {
    background-color: #218838;
}

table {
    width: 100%;
    margin-top: 20px;
    border-collapse: collapse;
}

table,
th,
td {
    border: 1px solid #ddd;
}

th,
td {
    padding: 10px;
    text-align: center;
}

th {
    background-color: #007BFF;
    color: white;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: #fff;
    padding: 20px;
    border-radius: 5px;
    width: 400px;
    text-align: center;
}

input {
    width: 100%;
    padding: 8px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

#generate-code {
    background-color: #007BFF;
    margin-top: 10px;
}

#generate-code:hover {
    background-color: #0056b3;
}