gh-142927: Add scrollbar support to Tachyon HTML dark mode

Author: Wulian233

Lib/profiling/sampling/_shared_assets/base.css

@@ -410,6 +410,27 @@ a.toolbar-btn:focus-visible {
   outline-offset: 2px;
 }
 
+/* --------------------------------------------------------------------------
+   Scrollbar
+   -------------------------------------------------------------------------- */
+* {
+  scrollbar-color: var(--border) var(--bg-secondary);
+}
+
+::-webkit-scrollbar {
+  width: 8px;
+  height: 8px;
+}
+
+::-webkit-scrollbar-thumb {
+  background: var(--border);
+  border-radius: 4px;
+}
+
+::-webkit-scrollbar-thumb:hover {
+  background: var(--text-muted);
+}
+
 /* --------------------------------------------------------------------------
    Shared Responsive
    -------------------------------------------------------------------------- */

Misc/NEWS.d/next/Library/2026-04-05-10-37-39.gh-issue-142927.B6Gtg9.rst

@@ -0,0 +1 @@
+Add scrollbar support to Tachyon HTML dark mode