Highlight color that forms around dropdown when clicked

As the title says when I click a dropdown menu a light blue highlight forms around it. And wont go away until I focus somewhere else. I've searched around and can't find where to remove it or at least change the color of it. Anyone have any ideas?

That's supplied by the browser itself and is not something which can be configured at the product level, short of possibly being able to prevent the focus styling entirely. I recommend against this, even if it is possible.
You can overwrite the --callToAction--hover value supplied within the theme files.

Thanks for the info. I think for now I am going to leave it but if not I'll try what you mentioned. Thank you.