I took some time to revise one of Uiflows open-source projects and added Memberstack to it.
I updated the styling, removed/renamed a few classes, updated the page copy, and added Memberstack.
This free webflow template is a simple login form with a background video, some custom code to animate the labels, and a tiny bit of custom CSS to style valid inputs.
Note: you could use this template with Memberstack's pre-built UI (the one you see in the template now) or you could link directly to your own custom signup form. Totally up to you.
If you have any questions, feel free to drop a comment below. Thanks!