# Local development with Trellis

**URL:** https://discourse.roots.io/t/local-development-with-trellis/16841
**Category:** trellis
**Tags:** sage9, trellis
**Created:** 2019-10-16T10:07:08Z
**Posts:** 14
**Showing post:** 10 of 14

## Post 10 by @strarsis — 2019-10-17T19:49:23Z

It could be a CORS issue:

> [@Sage 9 + BrowserSync not loading any CSS at all on 'yarn run start'](https://discourse.roots.io/t/sage-9-browsersync-not-loading-any-css-at-all-on-yarn-run-start/11332/26):
>
> @Simeon: Edit: According to author BrowserSync has to be configured with advanced key: new BrowserSyncPlugin({ target, open: config.open, proxyUrl: config.proxyUrl, watch: config.watch, delay: 500, advanced: { browserSync: { cors: true, }, }, }), Related issues:

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