diff --git a/Gemfile.lock b/Gemfile.lock
index 844dc4d..7ac5f92 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,6 +3,7 @@ PATH
   specs:
     sn-collab-editor (0.3.0)
       rails (~> 5)
+      sass-rails
 
 GEM
   remote: https://rubygems.org/
@@ -53,6 +54,7 @@ GEM
     concurrent-ruby (1.1.9)
     crass (1.0.6)
     erubi (1.10.0)
+    ffi (1.15.4)
     globalid (0.4.2)
       activesupport (>= 4.2.0)
     i18n (1.8.10)
@@ -65,9 +67,11 @@ GEM
     marcel (1.0.1)
     method_source (1.0.0)
     mini_mime (1.1.0)
+    mini_portile2 (2.6.1)
     minitest (5.14.4)
     nio4r (2.5.7)
-    nokogiri (1.11.7-x86_64-linux)
+    nokogiri (1.12.5)
+      mini_portile2 (~> 2.6.1)
       racc (~> 1.4)
     racc (1.5.2)
     rack (2.2.3)
@@ -98,6 +102,16 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.19.0, < 2.0)
     rake (13.0.3)
+    sass-rails (6.0.0)
+      sassc-rails (~> 2.1, >= 2.1.1)
+    sassc (2.4.0)
+      ffi (~> 1.9)
+    sassc-rails (2.1.2)
+      railties (>= 4.0.0)
+      sassc (>= 2.0)
+      sprockets (> 3.0)
+      sprockets-rails
+      tilt
     sprockets (4.0.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
@@ -107,6 +121,7 @@ GEM
       sprockets (>= 3.0.0)
     thor (1.1.0)
     thread_safe (0.3.6)
+    tilt (2.0.10)
     tzinfo (1.2.9)
       thread_safe (~> 0.1)
     websocket-driver (0.7.5)