Change Hex Code for Background on Checkout Page PayPal Express

[Janex]

I changed the hex code in the PayPal Express Page re: background for checkout
Using  #9933cc 
It saves in it's block
When I save the whole page on that extension the # sign is removed and only 9933cc is shown.
There is NO Change to any colour on the check out page
What shall I try?
Thanks for the assistance

[Basara]

Hello.
Check in live mode

[Janex]

Yes - I have purchased an order on the site and gone to the check out page - no color change.