Refactor the whole plugin

syntax/patch/scss.vim

@@ -0,0 +1,13 @@
+" If not loading https://github.com/cakebaker/scss-syntax.vim
+if !hlexists('scssNestedProperty')
+  silent! syntax clear scssDefinition
+  syntax region cssScssDefinition transparent matchgroup=cssBraces 
+        \ contains=@ScssSyntax,cssScssDefinition
+        \ contained containedin=cssScssVueStyle
+        \ start="{" end="}" 
+
+  " Extend to highlight all numbers in expression
+  syntax match cssValueNumber
+        \ /\W\zs\d\+\(\.\d\+\)\?%\?\ze\W/
+        \ contained containedin=cssScssDefinition
+endif