$cellBorders = [
                                Math::max($cellBorders[0], $cellStyle->getRules('border-top-width')),
                                Math::max($cellBorders[1], $cellStyle->getRules('border-right-width')),
                                Math::max($cellBorders[2], $cellStyle->getRules('border-bottom-width')),
                                Math::max($cellBorders[3], $cellStyle->getRules('border-left-width')),