Fully-responsive landing page made using CSS flexbox and grid

Pretty happy overall with the end result, especially having managed to complete the challenge without pulling in any major dependencies (Bootstrap, jQuery etc.) 💪🏼

• CSS-wise, I've taken a somewhat fluid/hybrid approach, with flexbox for mobile and tablet and then a bit of grid on top of that for wider screens
• I decided to have a bit of fun with one of the background images on tablet and desktop by using an absolutely-positioned pseudo-element to flip it on its head 🤭
• I ditched the fixed-top nav bar on tablet and desktop, and decided instead to use a dynamic 'back-to-top' button on vertical page scroll (> 500px) to aid navigation/UX
• I'm thinking the font-sizes on tablet might be a bit on the small side, so I'll probably rejig the stylesheet at some point
• I'll also look to refactor several repeated styles (e.g. for colours) using CSS variables whenever I get the chance

All feedback welcome!