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Strange black areas on Excel online
Apply or remove cell borders on a worksheet Tips
The Borders button shows the most recently used border style. To apply that style, click the Borders button (not the arrow).
If you apply a border to a selected cell, the border is also applied to adjacent cells that share a bordered cell boundary. For example, if you apply a box border to enclose the range B1:C5, the cells D1:D5 will acquire a left border.
If you apply two different types of borders to a shared cell boundary, the most recently applied border is displayed.
A selected range of cells is formatted as a single block of cells. If you apply a right border to the range of cells B1:C5, the border is displayed only on the right edge of the cells C1:C5.
If you want to print the same border on cells that are separated by a page break, but the border appears on only one page, you can apply an inside border. This way, you can print a border at the bottom of the last row of one page and use the same border at the top of the first row on the next page. Do the following:
Select the rows on both sides of the page break.
I would be happy to know if I could help.
Nikolino
I know I don't know anything (Socrates)