diff --git a/app/controllers/shares_controller.rb b/app/controllers/shares_controller.rb
index d70d66ff8..994742c3d 100644
--- a/app/controllers/shares_controller.rb
+++ b/app/controllers/shares_controller.rb
@@ -1,9 +1,10 @@
 # frozen_string_literal: true
 
 class SharesController < ApplicationController
-  layout 'public'
+  layout 'modal'
 
   before_action :authenticate_user!
+  before_action :set_body_classes
 
   def show
     serializable_resource = ActiveModelSerializers::SerializableResource.new(InitialStatePresenter.new(initial_state_params), serializer: InitialStateSerializer)
@@ -22,4 +23,8 @@ class SharesController < ApplicationController
       text: params[:text],
     }
   end
+
+  def set_body_classes
+    @body_classes = 'compose-standalone'
+  end
 end
diff --git a/app/javascript/styles/containers.scss b/app/javascript/styles/containers.scss
index 063db44db..cfe8ea643 100644
--- a/app/javascript/styles/containers.scss
+++ b/app/javascript/styles/containers.scss
@@ -53,6 +53,7 @@
     box-sizing: border-box;
 
     @media screen and (max-width: 400px) {
+      width: 100%;
       margin-top: 0;
       padding: 20px;
     }