diff --git a/src/scripts/books/reader.js b/src/scripts/books/reader.js
index 31f78e1..5733f02 100644
--- a/src/scripts/books/reader.js
+++ b/src/scripts/books/reader.js
@@ -97,7 +97,7 @@ function applyStyles() {
         document.documentElement.style.setProperty('--ln-max-width', config.ln.maxWidth + 'px');
         document.documentElement.style.setProperty('--ln-font-family', config.ln.fontFamily);
         document.documentElement.style.setProperty('--ln-text-color', config.ln.textColor);
-        document.documentElement.style.setProperty('--bg-base', config.ln.bg);
+        document.documentElement.style.setProperty('--color-bg-base', config.ln.bg);
         document.documentElement.style.setProperty('--ln-text-align', config.ln.textAlign);
     }