diff --git a/ipynb/Cryptarithmetic.ipynb b/ipynb/Cryptarithmetic.ipynb
index 8472ca3..07770d8 100644
--- a/ipynb/Cryptarithmetic.ipynb
+++ b/ipynb/Cryptarithmetic.ipynb
@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "<div align=right><i>Peter Norvig 2014</i></div>\n",
+    "<div align=\"right\">Peter Norvig 2014</i></div>\n",
     "\n",
     "# Cryptarithmetic (Alphametic) Problems\n",
     "\n",