_main.html.erb

<% withSecondarySidebar = local_assigns.fetch(:withSecondarySidebar, true) %>
<% withMobilePadding = local_assigns.fetch(:withMobilePadding, true) %>
<% mainColumnWidth = withSecondarySidebar ? '14' : '20' %>
<div class="main">
<div class="container wrapper <%= !withMobilePadding && 'wrapper--no-padding' %>">
<div class="grid grid--center">
<div class="grid__column grid__column--<%= mainColumnWidth %>@md">
<%= yield.presence %>
</div>
<% if withSecondarySidebar %>
<div class="grid__column grid__column--5@md grid__column--offset-1@md visible@md">
<%= render "supporters/shared/sidebar" %>
</div>
<% end %>
</div>
</div>
</div>