diff --git a/.github/workflows/book.yml b/.github/workflows/book.yml
index c04dc75..51e6b60 100644
--- a/.github/workflows/book.yml
+++ b/.github/workflows/book.yml
@@ -14,6 +14,7 @@ on:
     branches: [ main ]
     paths:
       - "src/**"
+      - "theme/**"
       - "book.css"
       - "book.toml"
       - "README.md"
diff --git a/theme/css/chrome.css b/theme/css/chrome.css
index 9dff5e9..c7729e5 100644
--- a/theme/css/chrome.css
+++ b/theme/css/chrome.css
@@ -230,8 +230,17 @@ a:hover > .hljs {
     text-decoration: underline;
 }
 
-.theme .hljs,
-.navy .hljs {
+.theme :not(pre) > .hljs {
+    background: var(--surface-1);
+}
+
+.theme pre > .hljs {
+    color: var(--text-1);
+    background: var(--surface-2);
+}
+
+.theme details pre > .hljs {
+    color: var(--text-1);
     background: var(--surface-1);
 }