Hi, I want to change the css of post_formats like aside and link but I didn’t find the file for that. Could you help me? I just want to know how to do it 
Hi @antonio,
I hope you are well today and thank you for your question.
You can change it by developing new CSS code which will have higher specificity so that it will overwrite the existing CSS. you can use this developed CSS code on your site by adding the following CSS code in the Custom CSS option of the latest version of Sparkling theme on the below path.
Admin Area -> Appearance -> Customize -> Sparkling Options -> Other -> Custom CSS
Best Regards,
Movin