SCSS doesn't update automatically

I've been trying to change the looks that neumorphism offers. For that, I've made some changes in ./_sass/main.scss; but since it doesn't have a front matter, jekyll seems to make no changes. I suppose it needs to be recompiled before changes are reflected but I'm not sure how I'm supposed to go about it.

I've also tried npx bundle exec gulp to rebuild contents as per gulpfile.js but that gives the following error:

$ npx bundle exec gulp
[21:06:51] Using gulpfile D:\Projects\PersonalWebsite\gulpfile.js
[21:06:51] Starting 'default'...
[21:06:51] Starting 'watchData'...
[21:06:51] Starting 'watchMarkup'...
[21:06:51] Starting 'watchScripts'...
[21:06:51] Starting 'watchStyles'...
[21:06:51] Starting 'styles'...
[21:06:51] Starting 'stylesVendors'...
[21:06:51] Starting 'scripts'...
[21:06:51] Starting 'scriptsVendors'...
Browserslist: caniuse-lite is outdated. Please run:
npx browserslist@latest --update-db
[21:06:54] Finished 'scripts' after 2.95 s
[21:06:54] Finished 'styles' after 2.95 s
[21:06:55] Finished 'stylesVendors' after 3.89 s
[21:06:58] Finished 'scriptsVendors' after 6.75 s
[21:06:58] Starting 'jekyll'...
[21:06:58] 'jekyll' errored after 9.94 ms
[21:06:58] Error: spawn bundle ENOENT
    at Process.ChildProcess._handle.onexit (internal/child_process.js:232:19)
    at onErrorNT (internal/child_process.js:407:16)
    at process._tickCallback (internal/process/next_tick.js:63:19)
[21:06:58] 'default' errored after 6.78 s
[21:06:58] The following tasks did not complete: <parallel>, watchData, watchMarkup, watchScripts, watchStyles
[21:06:58] Did you forget to signal async completion?

I'm not familiar with web development so I'm not really sure how to proceed. Any help will be great!

Windows version: 10 Ruby: 2.7.0 npx: 6.4.1 bundler: 2.1.4

longpdo / neumorphism

SCSS doesn't update automatically #32