app/views/box_organizer/_block_types.html.erb
<% block_types.in_groups_of(2) do |block1, block2| %>
<div style='float: left; width: 48%; padding-top: 2px;'>
<%= labelled_radio_button(block1.description, :type, block1.name) %>
</div>
<% if block2 %>
<div style='float: left; width: 48%; padding-top: 2px;'>
<%= labelled_radio_button(block2.description, :type, block2.name) %>
</div>
<% end %>
<% end %>