Column size in edit-address page

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I am using WP for a while (not much PHP knowledge) but new to WooCommerce. Seems I was able to setup most of what I need, except the columns width for billing and shipping addresses in client dashboard edit-address page. The provided link will show how it looks (to see it live one needs to login).
Please keep in mind that programming knowledge is limited to VB6 and VB scripts, and I have no CSS knowledge.
Thank you.

The page I need help with: [log in to see the link]

 

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