I edited /skin/frontend/sns_twen/default/less/mixin/product-block.less file to customize ico-sale. I’d try to put all /skin/frontend/sns_twen/default/css/theme-XXXXXX.css into a new folder named /skin/frontend/sns_twen/default/css/old theme/theme-XXXXXX.css hoping my theme-XXXXXX.css will be regenerated but noting. In the package i downloaded it doesn’t existe so I presume it’s a generated file, what i have to do to regenerate this file ?