Improve the look of the conf dashboard

app/views/admin/conferences/show.html.haml

@@ -3,16 +3,16 @@
   Dashboard for #{@conference.title}
 %hr
 .row
-  .col-sm-3
+  .col-sm-3.col-xs-6
     = render "big_statistic",
       icon: "user", subtitle: "Registration", value: @total_reg, delta: @new_reg
-  .col-sm-3
+  .col-sm-3.col-xs-6
     = render "big_statistic",
       icon: "check-square", subtitle: "Submission", value: @total_submissions, delta: @new_submissions
-  .col-sm-3
+  .col-sm-3.col-xs-6
     = render "big_statistic",
       icon: "file-text", subtitle: "Hour", value: @program_length, delta: @new_program_length
-  .col-sm-3
+  .col-sm-3.col-xs-6
     = render "big_statistic",
       icon: "archive", subtitle: "Withdrawn", value: @total_withdrawn, delta: @new_withdrawn
 

app/views/application/_big_statistic.haml

@@ -1,13 +1,12 @@
 - reverse ||= false
 - variant = variant_from_delta(delta, reverse: reverse)
-.dashbox.text-center
-  %span.fa
-    = fa_icon(icon)
-    = value
-  %p.text-nowrap
-    %small
+.dashbox.panel.panel-primary
+  .paenl-body.text-center
+    %span.fa
+      = fa_icon(icon)
+      = value
+    %p
       = subtitle.pluralize(value)
-      %span.label{ class: "label-#{variant}" }
-        = delta
-        since you last logged in
-
+      .label{ class: "label-#{variant}" }
+        = delta || 0
+        since last log in