diff --git a/static/css/epub.css b/static/css/epub.css
index fc7dbab..ec10fe2 100644
--- a/static/css/epub.css
+++ b/static/css/epub.css
@@ -4,7 +4,7 @@
 }
 .epubjs-hl {
     fill: yellow;
-    fill-opacity: 0.;3
+    fill-opacity: 0.3;
     mix-blend-mode: multiply;
 }
 .epubjs-hl.selected {