[Feature request] Add option to provide a custom background color

[kaje94]

Context
Other similar GitHub profile cards such as github-readme-streak-stats and github-readme-stats provide an option to customize the colors of the card as we wish. It would be nice to have this feature in github-profile-summary-cards as well

Can you achieve the same result doing it in an alternative way? Is the alternative considerable?
No

Has the feature been requested before?
No

If the feature request is approved, would you be willing to submit a PR?
Yes

[vn7n24fzkq]

My sincere apologies for the delayed response. After careful consideration, I believe it would be beneficial to incorporate the suggested feature. Would you still be interested in submitting a pull request?