Cleanup CSS add Snap! style block attachments

app/views/conferences/_tickets.haml

@@ -14,7 +14,7 @@
           -#   = conference.title
       .row.row-centered
         - tickets.each do |ticket|
-          .col-md-3.col-sm-3.col-centered.col-top
+          .col-lg-4.col-md-3.col-sm-3.col-centered.col-top
             = link_to(conference_tickets_path(conference.short_title),
               class: 'thumbnail') do
               .caption
@@ -23,5 +23,6 @@
                 .word_break
                   = markdown(ticket.description)
                 %button.btn-block.btn.btn-lg.btn-success
-                  %i.fa.fa-ticket.fa-fw
+                  %i.fa.fa-ticket.fa-fw{"aria-hidden": true}
                   = humanized_money_with_symbol(ticket.price)
+    .trapezoid