Submission table tweaks

smaller fontsize and use vertical scrolling for large tables

app/views/forms/show.html.erb

@@ -27,7 +27,7 @@
   </div>
 
   <div class="box table-wrapper">
-    <table class="table is-fullwidth is-striped is-hoverable">
+    <table class="submission-table table is-fullwidth is-striped is-hoverable">
       <thead>
         <tr>
           <% @form.spreadsheet_headers.each do |value| %>