body {

    font-family: Arial, sans-serif;

    line-height: 1.6;

    margin: 0;

    padding: 0;

    display: flex;

    flex-direction: column;

    align-items: center;

    background-color: #f5f5f5;

}



header {

    margin-top: 20px;

    text-align: center;

}



main {

    width: 100%;

    max-width: 1200px;

    margin-top: 20px;

    padding: 20px;

    background-color: #ffffff;

    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);

    border-radius: 8px;

}



label {

    display: block;

    margin-bottom: 5px;

    font-weight: bold;

}



textarea {

    width: 100%;

    height: 150px;

    padding: 10px;

    font-size: 16px;

    border: 1px solid #cccccc;

    border-radius: 4px;

    box-sizing: border-box;

}



#header-checkbox {

    margin-top: 10px;

}



#table-output {

    margin-top: 20px;

    max-height: 400px;

    overflow-y: auto;

    overflow-x: auto;

    border: 1px solid #cccccc;

    border-radius: 4px;

}



table {

    width: 100%;

    border-collapse: collapse;

}



table th, table td {

    padding: 8px;

    text-align: left;

    border-bottom: 1px solid #dddddd;

}



table tr:hover {

    background-color: #f1f1f1;

}



table th {

    position: sticky;

    top: 0;

    background-color: #ffffff;

    z-index: 1;

}