I have a Spree Commerce application with the spree_bootstrap gem installed by adding
gem 'spree_bootstrap', github: 'jdutil/spree_bootstrap'
<div class="container row">
<ul id="main-nav-bar" class="inline">
Create the file
app/views/spree/layouts/spree_application.html.erb. Copy and paste this content then edit as you wish :)
Repeat for any other Spree views and partials that you might want to restyle. If you'd like to know the paths you need to create & the content for a certain view or partial, check out the
app/views/spree folder of their GitHub repo.
You might need to restart your server before seeing any changes.