app/views/activities/edit.html.erb
<% content_for :page_title, t('activities.edit.page_title') %>
<div class="row justify-content-md-center mt-2">
<div class="col col-lg-8">
<h2><%= t('activities.edit.update_your_activity') %></h2>
</div>
</div>
<div class="row justify-content-md-center mt-2">
<div class="col col-lg-8">
<%= render 'form', activity: @activity %>
</div>
</div>