improve map spacing

client/less/main.less

@@ -1018,6 +1018,14 @@ hr {
   color: @gray-light;
 }
 
+.asterisk-explanation {
+  margin-top: -15px;
+}
+
+.map-buttons {
+  margin-top: -10px;
+}
+
 code {
   padding: 0;
 }

server/views/map/show.jade

@@ -1,7 +1,7 @@
 extends ../layout-wide
 block content
-        .text-center.map-fixed-header
-            p Challenges marked with * are required for certification
+        .text-center.map-fixed-header.asterisk-explanation
+            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
             hr