My site’s layout is falling apart on large desktop screens—the header and navigation bar wander, content sections shift unpredictably, and the footer refuses to stay put. I need those three areas locked down with clean, Bootstrap-powered HTML5/CSS3 so every desktop visitor sees a polished, consistent page. What I expect from you within the next 24-48 hours: • Correct all structural issues in the header, nav, content blocks, and footer, relying on Bootstrap rather than ad-hoc overrides. • Follow a mobile-first philosophy even though the immediate priority is flawless desktop rendering, so future smartphone or tablet tweaks remain straightforward. • Deliver lean, well-commented style sheets that trim any unused rules and improve initial paint times. • Verify results in the latest versions of Chrome, Firefox, Safari, and Edge. Send over one or two links to similar Bootstrap fixes you’ve handled, and outline any tools or techniques you’ll use to keep the CSS tidy and performant. Once everything displays perfectly and loads quickly, I’ll sign off and deploy.