Adapt to latest md changes

UI/WebServerResources/scss/styles.scss

@@ -19,6 +19,7 @@
 // fixme : refactor all this to meet our practices
 // ------------------------------------------------------------------------------
 @import 'core/mixins';
+@import 'core/layout-attributes';
 @import 'core/structure';
 @import 'core/layout';
 @import 'core/typography';