Fix globality of some custom styles

Author: 4ban

src/css/app.styl

@@ -1,3 +1,8 @@
+@import url('https://fonts.googleapis.com/css?family=Source+Code+Pro&display=swap');
+.code {
+  font-family: 'Source Code Pro', monospace;
+}
+
 // app global css
 .bg-vgrey {
   background: #CECFD0;

src/pages/Index.vue

@@ -847,8 +847,4 @@ export default {
 </script>
 
 <style>
-  @import url('https://fonts.googleapis.com/css?family=Source+Code+Pro&display=swap');
-  .code {
-    font-family: 'Source Code Pro', monospace;
-  }
 </style>