external css order not consistent

Hi,

When I pushed my website online, owl externals css where not loaded in the same order than on my local developpement server.

Local :
```

```
Online :
```
...

...
```

This leads to different rendering, especially the left-right arrows that have an ugly gray background instead of the transparent black one.

I don't know if the bug is in grav, shortcode-code or this repo though ?