Storefront theme hide banner, resize logo for mibile view

I have been using the @media screen code to resize and hide elements for mobile view.

Now, I want to hide the header image for mobile view.
I am using the storefront theme but cannot seem to find the banner id to do so.
I am providing the style.css file

/*
Theme Name:   	Storefront
Theme URI:    	https://www.woothemes.com/storefront
Author:       	WooThemes
Author URI:		https://www.woothemes.com
...

[moderator note: excessive amount of CSS moderated; please use the pastebin or post a live link to the site – https://codex.www.ads-software.com/Forum_Welcome#Posting_Code ]

Plz help