Fix Rounding & Mobile Menu

I run a small bike-repair shop in Utrecht and host our plain-HTML website from a private GitHub repo deployed on Netlify. Two annoyances are starting to scare customers away and I’d like them solved quickly, via a clean pull request to the repo... (Budget: $10 - $30 CAD, Jobs: CSS, Frontend Development, Git, HTML, HTML5, JavaScript, Mobile Development, Web Development)