Shopify Design & Responsiveness Fixes

I need a fast, tidy round of improvements on my existing Shopify store. First, I want every page audited for responsiveness on mobile, tablet, and desktop, then corrected so breakpoints look fluid and nothing overflows or misaligns... (Budget: $10 - $30 USD, Jobs: CSS, HTML, JavaScript, Shopify, Shopify Templates, Web Design, Web Development, Website Design)