Let me give some information. When I send an invoice to a customer and the customer logs into their account to pay the invoice the background of that invoice is white with the text gray making it very hard to read. I would like to change the background to Black. I have tried both codes, but it does not change the background color:
Thank you for your input.
Here is a link to a screenshot: https://drive.google.com/open?id=1M2uF2c6_qNsctJac_PUT8XrSsujxaF3u