Update wiki CSS

app/assets/stylesheets/page_bundles/build.scss

@@ -61,7 +61,7 @@
 
   .header-content {
     a {
-      color: var(--gl-text-color-heading);
+      color: var(--gl-text-color-default);
 
       &:hover {
         color: var(--blue-600, $blue-600);

app/assets/stylesheets/page_bundles/wiki.scss

@@ -37,7 +37,7 @@
 
     &:hover {
       a {
-        color: var(--black, $black);
+        color: var(--gl-text-color-default);
       }
     }
 
@@ -48,13 +48,6 @@
     }
   }
 
-  .wiki-list-expand-button,
-  .wiki-list-collapse-button {
-    color: $gray-400;
-    position: absolute;
-    right: $gl-spacing-scale-2;
-  }
-
   ul.wiki-pages,
   ul.wiki-pages li {
     list-style: none;
@@ -68,10 +61,6 @@
 }
 
 ul.wiki-pages-list.content-list {
-  a {
-    color: var(--blue-600, $blue-600);
-  }
-
   ul {
     list-style: none;
     margin-left: 0;

app/views/shared/wikis/_sidebar.html.haml

@@ -18,8 +18,8 @@
       .gl-flex.gl-place-content-between.gl-items-center.gl-pb-3.gl-pr-1{ class: (@sidebar_page ? 'js-wiki-expand-pages-list wiki-list collapsed gl-pl-0' : 'gl-pl-3') }
         .gl-flex.gl-items-center
           - if @sidebar_page
-            = render Pajamas::ButtonComponent.new(category: :tertiary, size: :small, icon: 'chevron-right', button_options: { class: "js-wiki-list-expand-button wiki-list-expand-button !gl-static gl-mr-2", data: { testid: 'expand-pages-list' } })
-            = render Pajamas::ButtonComponent.new(category: :tertiary, size: :small, icon: 'chevron-down', button_options: { class: "js-wiki-list-collapse-button wiki-list-collapse-button !gl-static gl-mr-2", data: { testid: 'expand-pages-list' } })
+            = render Pajamas::ButtonComponent.new(category: :tertiary, size: :small, icon: 'chevron-right', button_options: { class: "js-wiki-list-expand-button wiki-list-expand-button gl-mr-2", data: { testid: 'expand-pages-list' } })
+            = render Pajamas::ButtonComponent.new(category: :tertiary, size: :small, icon: 'chevron-down', button_options: { class: "js-wiki-list-collapse-button wiki-list-collapse-button gl-mr-2", data: { testid: 'expand-pages-list' } })
           %h2.gl-text-lg.gl-my-0.gl-mr-3= s_('Wiki|Pages')
           = gl_badge_tag @wiki_pages_count