...
- Copy /theme/abicloudDefault/css/theme_novncwmks.css
- Paste in your theme path css folder: /theme/mytheme/css/
Open the copied file and apply the desired changes
Note title Upgrading Abiquo Changes to the Abiquo default theme in /theme/abicloudDefault/css/theme_wmks.css will be lost when you upgrade Abiquo