The CSS Units Converter That Finally Fixed My Responsive Design Problems

The CSS Units Dilemma: How I Stopped Guessing and Built a Converter That Actually Works May 14, 2025 Tags: Responsive Design, CSS Architecture, Frontend Development, Cross-Device Testing I was up at 2am, panicking. Client website launch was 7 hours away, and everything looked terrible on mobile. Text was huge, buttons were overlapping, and the layout was a mess. I kept checking between the design mockup and my code. They matched perfectly in pixels, so what went wrong? Then it hit me - I'd been sloppy with my unit conversions again. Converting pixels to rems and ems by rough guesswork... and messing it up. Bad. The CSS Units Problem We All Hate If you build websites, you know this pain. The designer hands over a beautiful mockup with everything specified in pixels. But you know better than to use pixels everywhere. You need rem, em, vw and other units to make things responsive and accessible. So what do we do?...