Customize table quotation

Hello,

We are customising our quotation emails and would like to know if it is possible to change the background colour used in the quotation table, specifically the highlighted cell in the "Amount" column, which is currently displayed in a light yellow/green colour.

We would prefer to use a colour that better matches our brand identity.

Alternatively, it would also be perfectly fine for us to remove the highlighted background colour completely and keep the table cells on a plain white background, which would better suit our brand style.

Could you please let us know:

1. Whether this colour can be customised.
2. Where this setting can be changed.
3. If custom CSS or template modifications are required.

Thank you for your assistance.