Searchbar customization

Hello Team,

First, I have the searchbar on my site using the shortcode and it appears on every page. But the Autocomplete only works on shop category pages. It doesn’t work on Single Product pages and standard content Pages. I need autocomplete to work on every pages across the site.

Second, How can i customize submit search button color.

And finally, I want to add a new search fields by location is that possible?

Thanks,
Aicha