Hi @sebagela,
I hope you are well today and thank you for your question.
Yes it’s possibile to modify Call to Action by creating a child theme of Sparkling theme and then overwrite the function sparkling_call_for_action in it and customize it as described in the below thread.
https://colorlibsupport.com/t/call-to-action-bar/#post-27768
Best Regards,
Movin