drupal integration - revised UI of course slim header to coincide with marketing site theme

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

@@ -61,10 +61,10 @@ nav.course-material {
 }
 
 header.global.slim {
-  border-bottom: 1px solid $outer-border-color;
   @include box-shadow(0 1px 2px rgba(0, 0, 0, .1));
   height: 50px;
-  @include linear-gradient(top, #fff, #eee);
+  border-bottom: 1px solid $outer-border-color;
+  background: $white;
 
   .guest .secondary {
     margin-right: 0;
@@ -111,7 +111,7 @@ header.global.slim {
     margin-right: 20px;
     padding-right: 20px;
 
-    &::before {
+    &:before {
       @extend .faded-vertical-divider;
       content: "";
       display: block;
@@ -122,7 +122,7 @@ header.global.slim {
       width: 1px;
     }
 
-    &::after {
+    &:after {
       @extend .faded-vertical-divider-light;
       content: "";
       display: block;
@@ -134,7 +134,7 @@ header.global.slim {
     }
   }
 
-  .find-courses-button {
+  .nav-global {
     display: none;
   }