fixed anonymous header bug

lms/static/sass/course/layout/_courseware_header.scss

@@ -55,12 +55,16 @@ nav.course-material {
   }
 }
 
-header.global {
+header.global.slim {
   border-bottom: 1px solid #bbb;
   @include box-shadow(0 1px 2px rgba(0, 0, 0, .1));
   height: 50px;
   @include linear-gradient(top, #fff, #eee);
 
+  .guest .secondary {
+    display: none;
+  }
+
   nav {
     padding-top: 5px;
   }
@@ -124,4 +128,14 @@ header.global {
       font-weight: bold;
     }
   }
+
+  a#signup {
+    position: relative;
+    margin-top: 4px;
+    padding: 6px 12px 8px;
+    text-transform: none;
+    font-size: 14px;
+    font-weight: bold;
+    letter-spacing: 0;
+  }
 }

lms/templates/navigation.html

@@ -5,7 +5,11 @@
 <%namespace name='static' file='static_content.html'/>
 <%! from django.core.urlresolvers import reverse %>
 
-<header class="global" aria-label="Global Navigation">
+%if course:
+  <header class="global slim" aria-label="Global Navigation">
+%else:
+  <header class="global" aria-label="Global Navigation">
+%endif
   <nav>
     <h1 class="logo"><a href="${reverse('root')}"></a></h1>