You can develop advanced themes with your favourite IDE or editor. To get started, download the Advanced Themed Demo or export an Advanced theme and un-zip the folder.
Open the theme in your editor.
Make sure the settings in the theme-uploader(.sh or.cmd) are valid.
Make changes to your theme.
Make sure that you have enabled external theme import. Navigate in Confluence to: Config > Refined Administration > Themes > Advanced Themes and click on "Enable".
Automatically upload your theme by running ./theme-uploader.sh (mac & linux, make sure it's executable run: "chmod +x theme-uploader.sh") or ./theme-uploader.cmd (Windows)
See your uploaded theme in confluence. Navigate in Confluence to: Config > Theme Configurations > Themes > Advanced Themes
Use SASS
Do you want to use SASS? Check out this branch https://bitbucket.org/refinedwikiteam/advanced-theme-demo-for-confluence/src/sass