Shopify Theme Button Integration

I need a few targeted edits to my Shopify theme. The priority is a new custom button that links straight to a product page. It must appear in several positions on the same collection page, blend with the existing design, and stay fully manageable through the theme editor whenever possible.

Alongside inserting the button, I’d like minor visual tweaks: adjusting font size where the button sits and tightening or loosening spacing so everything still feels balanced on desktop and mobile.

Deliverables
• Liquid + CSS code snippets (with clear comments) that render the button in all requested spots on the collection page.
• Styling adjustments for font sizing and element spacing around the new button.
• A quick walkthrough (text or short Loom) showing how I can change the product URL or duplicate the button later.

Please work directly in a duplicate theme, then pass the finished files or grant me a preview so I can test before publishing.