Just as an FYI, in that page's source code, this appears to be the line used to create that non-button button.  I don't think I've ever encountered class "btn-shape" before.

<div class="btn-shape"><a data-fancybox data-src="#form" class="btn btn--md btn--yellow btn--float mx-md--auto mb-md--20 b-r--50">GET INSTANT ACCESS</a></div>

The inventions in HTML coding are still very active indeed.  [I'm sure someone will tell me, though, that btn-shape has been around forever after this.]
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Brian - Windows 10, 64-Bit, Version 21H2, Build 19044  

You can't crush ideas by suppressing them. You can only crush them by ignoring them.
     ~ Ursula LeGuin, The Dispossessed