switch to global variable file import for scss

client/vue.config.js

@@ -1,4 +1,11 @@
 module.exports = {
   outputDir: '../dist/',
   assetsDir: './static',
+  css: {
+    loaderOptions: {
+      sass: {
+        prependData: '@import "@/scss/_variables.scss";'
+      }
+    }
+  }
 };