diff --git a/NEWS.md b/NEWS.md
index aecadde..c8ec289 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,7 @@
 # risotto (development version)
 
+* Fix overflow of code blocks with line numbers (#41)
+
 # risotto 0.3.0
 
 * Added support for favicons (#57)
diff --git a/static/css/typography.css b/static/css/typography.css
index 6369cf0..fcf63b6 100644
--- a/static/css/typography.css
+++ b/static/css/typography.css
@@ -154,6 +154,12 @@ pre {
     margin: 0 0 1.5rem 0;
 }
 
+/* Fix overflow when config markup.highlight.lineNos is true */
+/* See https://github.com/joeroe/risotto/issues/41 */
+.highlight div {
+	overflow-x: auto;
+}
+
 /* Emphasis */
 b,
 strong {