I'm impressed at just how hard it is to see what catppuccin actually looks like in VSCode without installing it first. The catppuccin github has no screenshots, and the catppuccin-for-vscode github/site has exactly one screenshot, which is split into diagonal "bands" for the four different versions of the scheme, and only one of those bands has a significant amount of code.
The catpuccin/vscode repo does have screenshots. They're collapsed under the "Previews" header, so you have to click each of the variants you want to view. Annoying, but they're there.
You can preview it in VSCode. Open command pallete, type "Color Theme", click on top on "Browse additional color themes", and type "catppuccin" in the box. Arrows up/down to preview, Enter to install it.