I love that your website offers a dark/light theme switch toggle, but I'd love it even more if it were "sticky" (sets a cookie so it stays dark or light) across the entire site and through multiple site visits.
There will be shortly. The Holloway format has more features (comments, search, infographic, etc.) than an epub so we launch web at first (today). If you purchase now it includes instant online access and future updates, and that includes upcoming epub and other download formats too.