excel formatting

I have an excel spreadsheet that has thousands of billing line items.
Column A lists the accountnumber and it is ordered by accountnumber.... low to high

so for example..... account 1111 might have 3 rows.  one row for each billing line item... ie... phone bill, garbage bill, sewer bill
account 2222 might only have 2 rows...   electric bill, garbage bill

i'd like to color the rows with a ledger style row color... by account.
meaning   account 1111... its 3 rows would be light green
account 2222's 2 rows would be white
account 3333's rows would revert back to light green.

is there a way to do this.  I really don't care what colors they are... just as long as they are light and transparent
attached is a manually created file that looks like what I am talking about.
experts-help.xlsx