I would like to increase the size of the email sign up banner photo on my mobile site so that the white space is even at the top and the bottom. It looks fine on desktop version. Also is it possible to reduce the size of the email box on mobile version. See a screenshot below.
From your Shopify admin dashboard, click on “Online Store” and then “Themes”.
Find the theme that you want to edit and click on “Actions” and then “Edit code”.
In the “Assets” folder, click on “base.css, style.css or theme.css” file, depending on which file your theme uses to store its CSS styles. At the bottom of the file, add the following CSS code: