improve style

app/assets/stylesheets/pages/issuable.scss

@@ -135,8 +135,10 @@
     padding: 0 0 5px 5px;
     line-height: 1;
 
-    #add-award {
+    .add-award {
       font-size: 27px;
+      color: #ccc;
+
       &:hover {
         text-decoration: none;
       }

app/views/votes/_votes_block.html.haml

@@ -7,7 +7,8 @@
         = vote.last.count
 
   .dropdown.awards-controls
-    %a#add-award{"data-toggle" => "dropdown", "data-target" => "#", "href" => "#"} +
+    %a.add-award{"data-toggle" => "dropdown", "data-target" => "#", "href" => "#"}
+      = icon('plus-circle')
     %ul.dropdown-menu.awards-menu
       - emoji_list.each do |emoji|
         %li{"data-emoji" => "#{emoji}"}= image_tag url_to_emoji(emoji), height: "20px", width: "20px"