Remove EE specific variables

app/assets/stylesheets/framework/variables.scss

@@ -270,16 +270,14 @@ $general-hover-transition-duration: 100ms;
 $general-hover-transition-curve: linear;
 $highlight-changes-color: rgb(235, 255, 232);
 $performance-bar-height: 35px;
-$system-header-height: 35px;
-$system-footer-height: $system-header-height;
 $flash-height: 52px;
 $context-header-height: 60px;
 $breadcrumb-min-height: 48px;
 
 // EE-only CSS variables START
+$system-header-height: 35px;
 $issue-box-upcoming-bg: #8f8f8f;
 $pages-group-name-color: #4c4e54;
-$ldap-members-override-bg: $orange-50;
 // EE-only CSS variables END
 
 /*
@@ -679,7 +677,6 @@ GitLab Plans
 $gl-gold-plan: #d4af37;
 $gl-silver-plan: #91a1ab;
 $gl-bronze-plan: #cd7f32;
-$gl-no-plan: $gl-gray-light;
 
 /*
 Cross-project Pipelines

app/assets/stylesheets/pages/members.scss

@@ -138,7 +138,7 @@
 }
 
 .alert-member-ldap {
-  background-color: $ldap-members-override-bg;
+  background-color: $orange-50;
 
   @include media-breakpoint-up(sm) {
     line-height: 40px;

ee/app/assets/stylesheets/framework/system_messages.scss

@@ -25,8 +25,8 @@
 
 .footer-message {
   bottom: 0;
-  height: $system-footer-height;
-  line-height: $system-footer-height;
+  height: $system-header-height;
+  line-height: $system-header-height;
 }
 
 .with-performance-bar {
@@ -104,7 +104,7 @@
   // navless pages' footer border eg: login page
   &.devise-layout-html body .footer-container,
   &.devise-layout-html body hr.footer-fixed {
-    bottom: $system-footer-height;
+    bottom: $system-header-height;
   }
 }
 
@@ -121,7 +121,7 @@
   }
 
   @if (map-get($map, system-footer) == true) {
-    $height: $height + $system-footer-height;
+    $height: $height + $system-header-height;
   }
 
   @if (map-get($map, flash) == true) {

ee/app/assets/stylesheets/pages/groups.scss

@@ -29,6 +29,6 @@
   }
 
   &:not([data-plan]) {
-    svg g { fill: $gl-no-plan; }
+    svg g { fill: $gl-gray-light; }
   }
 }

ee/app/assets/stylesheets/pages/projects.scss

@@ -82,7 +82,7 @@
 }
 
 .classification-label {
-  background-color: $common-red;
+  background-color: $red-500;
 }
 
 .load-wrapper {