diff --git a/internal/middleware/secureheaders.go b/internal/middleware/secureheaders.go
index ac528c4..fbe4ffd 100644
--- a/internal/middleware/secureheaders.go
+++ b/internal/middleware/secureheaders.go
@@ -17,7 +17,7 @@
 	"'sha256-CoGrkqEM1Kjjf5b1bpcnDLl8ZZLAsVX+BoAzZ5+AOmc='",
 	"'sha256-Rex7jo7NdAFHm6IM8u1LgCIn9Gr9p2QZ0bf6ZkK618g='",
 	"'sha256-karKh1IrXOF1g+uoSxK+k9BuciCwYY/ytGuQVUiRzcM='",
-	"'sha256-Wf3ZjOwjQb2z6NEAB3ff/dlNAx2IfCbBwKKEsuR3Ny8='",
+	"'sha256-mxm3e8M0u3nPPBmLIBgGuMvGUIL5LGv+HzV3bLAIBgw='",
 	// From static/frontend/search/search.tmpl
 	"'sha256-GZ+7ZnhhodcQDG6v/lrrpA8KWVHdCpgG0cxpOJdxYwU='",
 	// From static/frontend/styleguide/styleguide.tmpl
diff --git a/static/frontend/frontend.tmpl b/static/frontend/frontend.tmpl
index 0e6685e..d93e6f9 100644
--- a/static/frontend/frontend.tmpl
+++ b/static/frontend/frontend.tmpl
@@ -13,7 +13,7 @@
     </script>
     <script>
       (function() {
-        const theme = document.cookie.match(/prefers-color-scheme=(.+)/)?.[1]
+        const theme = document.cookie.match(/prefers-color-scheme=(light|dark|auto)/)?.[1]
         if (theme) {
           document.querySelector('html').setAttribute('data-theme', theme);
         }
@@ -29,9 +29,9 @@
     <link rel="shortcut icon" href="/static/shared/icon/favicon.ico">
     <!-- Only load the css reset for non-legacy pages -->
     {{if not .UseSiteWrapper}}
-      <link href="/static/shared/reset.css" rel="stylesheet">
+      <link href="/static/shared/reset.css?version={{.AppVersionLabel}}" rel="stylesheet">
     {{end}}
-    <link href="/static/frontend/frontend.css" rel="stylesheet">
+    <link href="/static/frontend/frontend.css?version={{.AppVersionLabel}}" rel="stylesheet">
     {{block "title" .}}
       <title>pkg.go.dev</title>
     {{end}}
diff --git a/static/shared/icon/icon.css b/static/shared/icon/icon.css
index 7d66f7a..cf22562 100644
--- a/static/shared/icon/icon.css
+++ b/static/shared/icon/icon.css
@@ -28,7 +28,7 @@
     contrast(88%);
 }
 @media (prefers-color-scheme: dark) {
-  :root:not([data-theme='light']) .go-Icon:root:not(.go-Icon--accented) {
+  :root:not([data-theme='light']) .go-Icon:not(.go-Icon--accented) {
     filter: brightness(0) saturate(100%) invert(100%) sepia(97%) saturate(13%) hue-rotate(245deg)
       brightness(103%) contrast(107%);
   }