This gem provides a simple helper that tells you whether it is currently CSS Naked Day.
This has been tested with Rails 6 but should work for some older versions. I made this for my personal website in about 30 minutes so if my math is wrong or anything let me know, I'm not a timezone expert.
Add the gem to your Gemfile.
gem 'css_naked_day_rails'
Install the gem.
bundle
Inside your layouts where you are loading your stylesheets or JavaScript packs.
<%= stylesheet_pack_tag('application', media: 'all') if !css_naked_day? %>
<%= javascript_pack_tag 'application' if !css_naked_day? %>
If you want to add a message about CSS Naked Day to one of your views.
<% if css_naked_day? -%>
<p>The website isn't broken, it's <%= link_to 'CSS Naked Day!', 'https://css-naked-day.github.io' %></p>
<% end -%>