Not build properly in Netlify

## Description

No styles displayed on Netlify git build Gridsome.

### Steps to reproduce
Build on local machine OK, but build on netlify no styles, using just Milligram CSS

https://github.com/xhostcomweb/milligram-vue-wp.git

### Expected result

Display Site

### Actual result

Site displays with no styles

### Environment

Libs:

- gridsome version: latest

- @gridsome/cli version: latest


Browser:

- [ ] Chrome (desktop) version XX

- [ ] Chrome (Android) version XX

- [ ] Chrome (iOS) version XX

- [ ] Firefox version XX

- [ ] Safari (desktop) version XX

- [ ] Safari (iOS) version XX

- [ ] IE version XX

- [ ] Edge version XX

 

For Tooling issues:

- Node version: XX  

- Platform:  

Others:

Linux Ubuntu local machine.