Kindly go to the element that you used for the text or headline and use the options of the element to fine-tune the color, size, and font of the text.
Then you can set a template or preset of that text element to use later for other texts. For more information kindly click here.
I also think that the best way of using WPML and our page builder is to use the page builder feature. I suggest that you duplicate the page in question using this plugin. Then please open up the Page Builder on that page. There you will see an icon at the bottom right section of the screen to add the translation.
There you will be prompted to duplicate the page. Please duplicate the page. Now you will have access to the Page Builder for both languages and you have full control over the size and everything of the elements for each language.