Use globalVars strategy to do v2-specific styling.

services/web/Gruntfile.coffee

@@ -150,6 +150,8 @@ module.exports = (grunt) ->
 					sourceMap: true
 					sourceMapFilename: "public/stylesheets/style.css.map"
 					sourceMapBasepath: "public/stylesheets"
+					globalVars:
+						'is-overleaf': false
 				files:
 					"public/stylesheets/style.css": "public/stylesheets/style.less"
 			ol:
@@ -157,6 +159,8 @@ module.exports = (grunt) ->
 					sourceMap: true
 					sourceMapFilename: "public/stylesheets/ol-style.css.map"
 					sourceMapBasepath: "public/stylesheets"
+					globalVars:
+						'is-overleaf': true
 				files:
 					"public/stylesheets/ol-style.css": "public/stylesheets/ol-style.less"
 

services/web/public/stylesheets/core/_common-variables.less

@@ -799,7 +799,6 @@
 
 
 // Custom
-@is-overleaf   : false;
 @header-height : 68px;
 @footer-height : 50px;
 

services/web/public/stylesheets/core/ol-variables.less

@@ -1,7 +1,5 @@
 @import "./_common-variables.less";
 
-@is-overleaf: true;
-
 @font-family-sans-serif: "Lato", sans-serif;
 
 @header-height: 68px;