diff --git a/theme/pdf/pdf.css b/theme/pdf/pdf.css
index 6a00f850..6da6cce6 100644
--- a/theme/pdf/pdf.css
+++ b/theme/pdf/pdf.css
@@ -77,6 +77,15 @@ pre {
     margin-left: 64.79pt;
   }
 
+/* two column list */
+ul.twocolumn {
+    column-count: 2;
+    column-gap: 15pt;
+    column-fill: balance;
+    widows: 0;
+    orphans: 0;
+  }
+  
 /*----Uncomment to change the TOC start page (set 
 the number to one page _after_ the one you want; 
 so 6 to start on v, 8 to start on vii, etc.)