Plugin: WooCommerce – Responsive theme, catalogue view = spacing issues.

I’m using a page with a (Woocommerce) catalogue shortcode as the shop front page along with the MyStile responsive theme. Shortcode’s set to show three columns of products which looks fine on larger screens but when it’s on a mobile device it reduces that to two columns (which is fine) but every third item is flush against the next one with no gap. Is there any way to add a space at the end of each line to keep things uniform on phones and tablets?

Site is https://www.maythethoughtsbewithyou.com/shop/ and issue’s most prominent on phones so far.

Thanks in advance for any suggestions.