Hi @prakash_s. Yes, I am by all means an amateur and it is totally fine, if you tell me that what I am asking for is outside the scope of your theme support. From reading all the support tickets I get the feel that it is not totally clear, when an issue is within our outside the scope of your support. Just let me know.
Meanwhile, For your information, I did observe the .x-acc, .x-acc-item, .x-acc-header, .x-collapsed, and .x-acc-content classes in the theme.co accordion documentation, and yet still don’t manage to control the background-color of the accordion as follows: 1) Background-color: #fff when open; and 2) background-color: transparent when collapsed. The reason I wish to style the accordion rather than the accordion item is that the accordion makes out 100% height of the parent column (which the accordion item does not).
As far as I can see, what you suggested, is just a general styling of the accordion item no matter if it is collapsed or not - not quite the same.
Thank you for your help.