diff --git a/assets/stylesheets/common/index.scss b/assets/stylesheets/common/_index.scss
similarity index 100%
rename from assets/stylesheets/common/index.scss
rename to assets/stylesheets/common/_index.scss
diff --git a/assets/stylesheets/mobile/_index.scss b/assets/stylesheets/mobile/_index.scss
new file mode 100644
index 0000000..3211ef3
--- /dev/null
+++ b/assets/stylesheets/mobile/_index.scss
@@ -0,0 +1 @@
+@import "activity-calendar";
diff --git a/assets/stylesheets/mobile/activity-calendar.scss b/assets/stylesheets/mobile/activity-calendar.scss
new file mode 100644
index 0000000..193e065
--- /dev/null
+++ b/assets/stylesheets/mobile/activity-calendar.scss
@@ -0,0 +1,9 @@
+.rewind-report-page.-activity-calendar {
+  .rewind-calendar {
+    border-spacing: 1px;
+  }
+
+  .rewind-calendar-cell {
+    border: 0;
+  }
+}
diff --git a/plugin.rb b/plugin.rb
index f694d31..25640c2 100644
--- a/plugin.rb
+++ b/plugin.rb
@@ -12,7 +12,8 @@ enabled_site_setting :discourse_rewind_enabled
 
 register_svg_icon "repeat"
 
-register_asset "stylesheets/common/index.scss"
+register_asset "stylesheets/common/_index.scss"
+register_asset "stylesheets/mobile/_index.scss", :mobile
 
 module ::DiscourseRewind
   PLUGIN_NAME = "discourse-rewind"