If that’s any use, the background can be found here – http://wagerfield.github.io/flat-surface-shader/
The site you showed doesn’t look like much more than some text slapped on this background, but if I remember correctly, I’ve seen some items here on ThemeForest that used this effect. I can’t seem to find them, though; maybe you can search for them in the Marketing->Landing Pages, or HTML->Miscellaneous, or HTML->Specialty Pages.
Sorry I couldn’t be of more help here.
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