#show-hide-column thead th {
    --ins-table-bg-state: #f8f9fa; /* Light gray */
    --ins-table-color: #343a40; /* Dark text */
    box-shadow: inset 0 0 0 9999px #f8f9fa !important; /* Override masking layer */
    color: #343a40 !important;
    font-weight: 600;
}

#show-hide-column thead {
    --ins-table-bg: #f8f9fa;
    --ins-table-color: #343a40;
    box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.1); /* Darker shadow */
    border-bottom: none; /* Remove outer border to avoid duplication */
}

    #show-hide-column thead th {
        border-bottom: 1px solid #dee2e6; /* Keep clean inner border */
    }