diff --git a/_site/styles.css b/_site/styles.css
index e22ad3668..323794a4c 100644
--- a/_site/styles.css
+++ b/_site/styles.css
@@ -133,6 +133,14 @@ body[data-scroll-locked] {
     top: var(--banner-height, 0px) !important;
 }
 
+/* Float the expand/collapse chevron to the right edge of each collapsible
+   sidebar group. The group button is a flexbox with two children — the label
+   div and the chevron div — so pushing the chevron container's left margin to
+   auto pins it to the far right while the label stays left-aligned. */
+#sidebar button[aria-expanded] > div:last-child {
+    margin-left: auto;
+}
+
 /* `navbar-cta.js` injects the GitHub stars + Get-started button into
    `#navbar-transition-maple` after Mintlify hydrates. The navbar is
    `justify-content: flex-end`, so the inserted children push the existing