fix map button size

server/views/map/show.jade

@@ -3,7 +3,7 @@ block content
         .text-center.map-fixed-header
             p Challenges required for certifications are marked with a *
             .row.map-buttons
-                button.center-block.btn.btn-sm.btn-block.btn-primary.active#showAll Collapse all challenges
+                button.center-block.btn.btn-block.btn-primary.active#showAll Collapse all challenges
             .row.map-buttons
                 .input-group
                     input#map-filter.form-control(type="text" placeholder="Type a challenge name" autocomplete="off" value="")