clean code

src/client/styles/scss/theme/_apply-colors-dark.scss

@@ -173,8 +173,8 @@ legend {
 .admin-page {
   #themeOptions {
     .theme-option-container.active a {
-      background-color: darken($bgcolor-theme, 15%);
-      border-color: darken($bgcolor-theme, 15%);
+      background-color: darken(theme-color('primary'), 15%);
+      border-color: darken(theme-color('primary'), 15%);
     }
   }
 }

src/client/styles/scss/theme/_apply-colors-light.scss

@@ -16,7 +16,7 @@
  */
 header.affix {
   .logo-mark {
-    fill: $bgcolor-theme;
+    fill: theme-color('primary');
   }
 }
 
@@ -72,8 +72,8 @@ header.affix {
 .admin-page {
   #themeOptions {
     .theme-option-container.active a {
-      background-color: lighten($bgcolor-theme, 20%);
-      border-color: lighten($bgcolor-theme, 20%);
+      background-color: lighten(theme-color('primary'), 20%);
+      border-color: lighten(theme-color('primary'), 20%);
     }
   }
 }