ui: fix typo & add stylus style (#1195)

packages/ui-default/theme/dark.styl

@@ -119,6 +119,9 @@ $hover-background-color = #424242
   .sidebar-user-profile .user-profile-name
     color: #bbb
 
+  .section__tab-header-item
+    color: #d8e0e6 !important
+
   .section__tab-header-item:hover
     background-color: #171717
 
@@ -275,6 +278,9 @@ $hover-background-color = #424242
   .autocomplete-tag
     background-color: #ff0000
 
+  .problem__tag-item
+    color: #d8dee3
+
   .problem__tag-link
     background-color: #1f1f1f
     color: #aaa!important
@@ -395,3 +401,7 @@ $hover-background-color = #424242
 
   &.page--contest_scoreboard .star-highlight 
     background: #6f757b
+
+  .search-sort
+    color: #eee
+    background-color: #1f1f1f