diff --git a/Gemfile.lock b/Gemfile.lock
index 844dc4d..5f14a6a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,47 +3,48 @@ PATH
   specs:
     sn-collab-editor (0.3.0)
       rails (~> 5)
+      sass-rails
 
 GEM
   remote: https://rubygems.org/
   specs:
-    actioncable (5.2.6)
-      actionpack (= 5.2.6)
+    actioncable (5.2.6.3)
+      actionpack (= 5.2.6.3)
       nio4r (~> 2.0)
       websocket-driver (>= 0.6.1)
-    actionmailer (5.2.6)
-      actionpack (= 5.2.6)
-      actionview (= 5.2.6)
-      activejob (= 5.2.6)
+    actionmailer (5.2.6.3)
+      actionpack (= 5.2.6.3)
+      actionview (= 5.2.6.3)
+      activejob (= 5.2.6.3)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 2.0)
-    actionpack (5.2.6)
-      actionview (= 5.2.6)
-      activesupport (= 5.2.6)
+    actionpack (5.2.6.3)
+      actionview (= 5.2.6.3)
+      activesupport (= 5.2.6.3)
       rack (~> 2.0, >= 2.0.8)
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.2.6)
-      activesupport (= 5.2.6)
+    actionview (5.2.6.3)
+      activesupport (= 5.2.6.3)
       builder (~> 3.1)
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activejob (5.2.6)
-      activesupport (= 5.2.6)
+    activejob (5.2.6.3)
+      activesupport (= 5.2.6.3)
       globalid (>= 0.3.6)
-    activemodel (5.2.6)
-      activesupport (= 5.2.6)
-    activerecord (5.2.6)
-      activemodel (= 5.2.6)
-      activesupport (= 5.2.6)
+    activemodel (5.2.6.3)
+      activesupport (= 5.2.6.3)
+    activerecord (5.2.6.3)
+      activemodel (= 5.2.6.3)
+      activesupport (= 5.2.6.3)
       arel (>= 9.0)
-    activestorage (5.2.6)
-      actionpack (= 5.2.6)
-      activerecord (= 5.2.6)
+    activestorage (5.2.6.3)
+      actionpack (= 5.2.6.3)
+      activerecord (= 5.2.6.3)
       marcel (~> 1.0.0)
-    activesupport (5.2.6)
+    activesupport (5.2.6.3)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
@@ -53,60 +54,74 @@ GEM
     concurrent-ruby (1.1.9)
     crass (1.0.6)
     erubi (1.10.0)
-    globalid (0.4.2)
-      activesupport (>= 4.2.0)
-    i18n (1.8.10)
+    ffi (1.15.5)
+    globalid (1.0.0)
+      activesupport (>= 5.0)
+    i18n (1.10.0)
       concurrent-ruby (~> 1.0)
-    loofah (2.10.0)
+    loofah (2.14.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.1)
       mini_mime (>= 0.1.1)
-    marcel (1.0.1)
+    marcel (1.0.2)
     method_source (1.0.0)
-    mini_mime (1.1.0)
-    minitest (5.14.4)
-    nio4r (2.5.7)
-    nokogiri (1.11.7-x86_64-linux)
+    mini_mime (1.1.2)
+    mini_portile2 (2.8.0)
+    minitest (5.15.0)
+    nio4r (2.5.8)
+    nokogiri (1.13.3)
+      mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
-    racc (1.5.2)
+    racc (1.6.0)
     rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
-    rails (5.2.6)
-      actioncable (= 5.2.6)
-      actionmailer (= 5.2.6)
-      actionpack (= 5.2.6)
-      actionview (= 5.2.6)
-      activejob (= 5.2.6)
-      activemodel (= 5.2.6)
-      activerecord (= 5.2.6)
-      activestorage (= 5.2.6)
-      activesupport (= 5.2.6)
+    rails (5.2.6.3)
+      actioncable (= 5.2.6.3)
+      actionmailer (= 5.2.6.3)
+      actionpack (= 5.2.6.3)
+      actionview (= 5.2.6.3)
+      activejob (= 5.2.6.3)
+      activemodel (= 5.2.6.3)
+      activerecord (= 5.2.6.3)
+      activestorage (= 5.2.6.3)
+      activesupport (= 5.2.6.3)
       bundler (>= 1.3.0)
-      railties (= 5.2.6)
+      railties (= 5.2.6.3)
       sprockets-rails (>= 2.0.0)
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.3.0)
+    rails-html-sanitizer (1.4.2)
       loofah (~> 2.3)
-    railties (5.2.6)
-      actionpack (= 5.2.6)
-      activesupport (= 5.2.6)
+    railties (5.2.6.3)
+      actionpack (= 5.2.6.3)
+      activesupport (= 5.2.6.3)
       method_source
       rake (>= 0.8.7)
       thor (>= 0.19.0, < 2.0)
-    rake (13.0.3)
-    sprockets (4.0.2)
+    rake (13.0.6)
+    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 (4.0.3)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
-    sprockets-rails (3.2.2)
-      actionpack (>= 4.0)
-      activesupport (>= 4.0)
+    sprockets-rails (3.4.2)
+      actionpack (>= 5.2)
+      activesupport (>= 5.2)
       sprockets (>= 3.0.0)
-    thor (1.1.0)
+    thor (1.2.1)
     thread_safe (0.3.6)
+    tilt (2.0.10)
     tzinfo (1.2.9)
       thread_safe (~> 0.1)
     websocket-driver (0.7.5)