adjust default

src/client/styles/scss/theme/default.scss

@@ -133,9 +133,9 @@ html[dark] {
   $bgcolor-sidebar-nav-item-active: rgba(#969494, 0.3); // optional
   $text-shadow-sidebar-nav-item-active: 0px 0px 10px #0099ff; // optional
   // Sidebar resize button
-  $color-resize-button: $color-global;
+  $color-resize-button: white;
   $bgcolor-resize-button: $primary;
-  $color-resize-button-hover: $color-global;
+  $color-resize-button-hover: white;
   $bgcolor-resize-button-hover: darken($bgcolor-resize-button, 5%);
   // Sidebar contents
   $bgcolor-sidebar-context: #111d2f;