The padding in the grid footer is not consistent with the padding of the header and cells when spreadsheets is initialized on the same page.
The grid’s cells left-right padding is supposed to be 12px, however when the spreadsheet css files are loaded it gets overriden to 8th pixels.
Also the last column becomes 5px which makes the UI looks unfinished and confusing.
This is very well visible when the content of the footer is set to be “sum” instead of plain text.