dark mode sidebar button.

src/theme/Navbar/Content/index.tsx

@@ -49,7 +49,10 @@ export default function NavbarContent(): JSX.Element {
       <div className="col col--2">
         <button
           onClick={dispatch.toggleSidebar}
-          className={styles.sidebarButton}
+          className={clsx(
+            styles.sidebarButton,
+            hiddenDesktopSidebar && styles.expand,
+          )}
         >
           {!hiddenDesktopSidebar ? <ChevronIcon /> : <HamburgerIcon />}
         </button>

src/theme/Navbar/Content/styles.module.scss

@@ -63,6 +63,20 @@
 
   width: 52px;
   height: 46px;
+
+  &.expand {
+    svg,
+    svg * {
+      fill: currentColor;
+    }
+  }
+
+  &:not(.expand) {
+    svg,
+    svg * {
+      stroke: currentColor;
+    }
+  }
 }
 
 %menu-common {