diff --git a/book.toml b/book.toml
index 41f36c0..aadcb0e 100644
--- a/book.toml
+++ b/book.toml
@@ -16,7 +16,7 @@ preferred-dark-theme = "ayu"
 git-repository-url = "https://github.com/cjburkey01/ClaimChunk"
 edit-url-template = "https://github.com/cjburkey01/claimchunk-site/edit/main/{path}"
 additional-js = []
-additional-css = ["css/downloads.css", "css/language-picker.css"]
+additional-css = ["src/css/downloads.css", "src/css/language-picker.css"]
 no-section-label = true
 
 [output.html.print]
diff --git a/css/downloads.css b/src/css/downloads.css
similarity index 100%
rename from css/downloads.css
rename to src/css/downloads.css
diff --git a/css/language-picker.css b/src/css/language-picker.css
similarity index 100%
rename from css/language-picker.css
rename to src/css/language-picker.css