Yarn dev doesn't deliver changes

Themes
1 
root@vps818138:/var/www/ghost/content/themes/Casper-3.0.12# yarn
yarn install v1.22.4
[1/5] Validating package.json...
warning casper@3.0.12: The engine "ghost" appears to be invalid.
warning casper@3.0.12: The engine "ghost-api" appears to be invalid.
[2/5] Resolving packages...
[3/5] Fetching packages...
info fsevents@1.2.12: The platform "linux" is incompatible with this module.
info "fsevents@1.2.12" is an optional dependency and failed compatibility check. Excluding it from installation.
[4/5] Linking dependencies...
[5/5] Building fresh packages...
Done in 10.21s.
root@vps818138:/var/www/ghost/content/themes/Casper-3.0.12# yarn dev
yarn run v1.22.4
warning casper@3.0.12: The engine "ghost" appears to be invalid.
warning casper@3.0.12: The engine "ghost-api" appears to be invalid.
$ gulp
[12:18:54] Using gulpfile /var/www/ghost/content/themes/Casper-3.0.12/gulpfile.js
[12:18:54] Starting 'default'...
[12:18:54] Starting 'css'...
[12:18:56] Finished 'css' after 1.92 s
[12:18:56] Starting 'js'...
[12:18:56] Finished 'js' after 225 ms
[12:18:56] Starting 'serve'...
[12:18:56] Finished 'serve' after 5.3 ms
[12:18:56] Starting 'cssWatcher'...
[12:18:56] Starting 'hbsWatcher'...
[12:19:16] Starting 'hbs'...
[12:19:16] /var/www/ghost/content/themes/Casper-3.0.12/author.hbs reloaded.
[12:19:16] /var/www/ghost/content/themes/Casper-3.0.12/default.hbs reloaded.
[12:19:16] /var/www/ghost/content/themes/Casper-3.0.12/error-404.hbs reloaded.
[12:19:16] /var/www/ghost/content/themes/Casper-3.0.12/error.hbs reloaded.
[12:19:16] /var/www/ghost/content/themes/Casper-3.0.12/index.hbs reloaded.
[12:19:16] /var/www/ghost/content/themes/Casper-3.0.12/page.hbs reloaded.
[12:19:16] /var/www/ghost/content/themes/Casper-3.0.12/post.hbs reloaded.
[12:19:16] /var/www/ghost/content/themes/Casper-3.0.12/tag.hbs reloaded.
[12:19:16] /var/www/ghost/content/themes/Casper-3.0.12/partials/header-background.hbs reloaded.
[12:19:16] /var/www/ghost/content/themes/Casper-3.0.12/partials/post-card.hbs reloaded.
[12:19:16] /var/www/ghost/content/themes/Casper-3.0.12/partials/site-header.hbs reloaded.
[12:19:16] /var/www/ghost/content/themes/Casper-3.0.12/partials/site-nav.hbs reloaded.
[12:19:16] /var/www/ghost/content/themes/Casper-3.0.12/partials/subscribe-form.hbs reloaded.
[12:19:16] /var/www/ghost/content/themes/Casper-3.0.12/partials/icons/avatar.hbs reloaded.
[12:19:16] /var/www/ghost/content/themes/Casper-3.0.12/partials/icons/facebook.hbs reloaded.
[12:19:16] /var/www/ghost/content/themes/Casper-3.0.12/partials/icons/loader.hbs reloaded.
[12:19:16] /var/www/ghost/content/themes/Casper-3.0.12/partials/icons/rss.hbs reloaded.
[12:19:16] /var/www/ghost/content/themes/Casper-3.0.12/partials/icons/twitter.hbs reloaded.
[12:19:16] Finished 'hbs' after 58 ms

This is what I get but when I check live site there are no changes. I need to make ghost retart to see changes which is not very effective.

Any idea why I don’t see changes?

2

Ok found solution. Somehow I missed section in docs about live and dev environment.
Need to host localy to see changes same time.