At 34 Cross, we wanted to develop our new website to be responsive, mobile friendly, and easily load on even 2G networks using only HTML and CSS. In this article we’ll tell you about the challenges we faced in both design and speed optimization of the site, and how we overcame them. First, we’ll focus on the scrolling parallax effect. Next, we show some interactive features that are possible through CSS alone. Finally, we include a checklist of things to consider for performance in general.