body {
    font-family: Arial, sans-serif;
    margin: 20px;
    background-color: #f4f4f9;
}

h1 {
    color: #333;
    text-align: center;
}

form {
    margin-bottom: 20px;
    text-align: center;
}

label {
    display: block;
    margin-top: 10px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    box-shadow: 0 2px 3px rgba(0,0,0,0.1);
}

th, td {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: left;
}

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

tbody tr:nth-child(even) {
    background-color: #f9f9f9;
}

tbody tr:hover {
    background-color: #f1f1f1;
}

.selectable {
    cursor: pointer;
}

td[contenteditable="true"] {
    background-color: #fffbea;
}

#download-btn {
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 16px;
    background-color: #28a745;
    color: white;
    border: none;
    cursor: pointer;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

#download-btn:hover {
    background-color: #218838;
}