So far, the only way I know is to check font, size, color and alignment of elements embedded in the theme using Elementor editor or YellowPencil and manually updating them in the third party element with YellowPencil. This process is tedious but there is a lot more that goes into crafting the look of the theme like boxes and buttons. And I think there is no contact form from Gillion in the template that I am using, so I am totally blank about the styling that will suit the theme.
The theme styles all the form elements but some plugins like elementor overwrite those styles by applying their own styles so you have to contact the plugin’s support to remove their styles.