Describes the cause and action for error messages.
Error Message(English)：
gridlines missing from some cells
How to Fix Missing Gridlines in an Excel Worksheet - Guiding Tech
https://www.guidingtech.com/29241/fix-missing-gridlines-excel/
Excel Troubleshooting: The Gridlines are Missing - YouTube
https://www.youtube.com/watch?v=KbglByW-pMw
https://www.youtube.com/watch?v=KbglByW-pMw
How to show gridlines in Excel; hide (remove) lines - Ablebits.com
https://www.ablebits.com/office-addins-blog/2014/04/23/hide-show-gridlines-excel/
Show or hide gridlines on a worksheet - Office Support
https://support.office.com/en-ie/article/show-or-hide-gridlines-on-a-worksheet-3ef5aacb-4539-4ad5-99・・・
Reset Excel to default borders - Stack Overflow
https://stackoverflow.com/questions/4953770/reset-excel-to-default-borders/33719320
Grid Lines Not Showing in Excel | Chron.com
https://smallbusiness.chron.com/grid-lines-not-showing-excel-33278.html
How to erase the gridlines in excel - Quora
https://www.quora.com/How-do-you-erase-the-gridlines-in-excel
Gridlines in Excel - How to Remove it, Change it, and Print it
https://trumpexcel.com/working-gridlines-excel/