How do i change the background color?

Excel tip:

Edit and format multiple worksheets in one operation

To select two or more non-adjacent worksheets, click on the tab of each worksheet, while holding down the [CTRL] key.
To select two or more adjacent worksheets, click on the tab of the first worksheet and then on the tab of the last worksheet, while holding down the [SHIFT] key.
Enter or modify your data and apply the necessary formatting options to the sheet that's displayed

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