fixed post body textarea width in post form

app/views/posts/_form.html.erb

@@ -9,7 +9,7 @@
         <% flash.now[:error] = @post.errors.full_messages.join(', and ') %>
       <% end %>
       <%= f.label :body %>
-      <%= f.text_area :body, :width => "80%", :rows => 15 %>
+      <%= f.text_area :body, :style => "width:98%", :rows => 15 %>
     </div>
     <div class="module_footer">
         <span class="input">