added in margin

Author: Tom-van-Woudenberg

book/08/sympy.ipynb

@@ -51,6 +51,16 @@
     "This page reuses CC BY content from {cite:t}`sympy`. {fa}`quote-left`[Find out more here](external_resources)\n",
     "```\n",
     "\n",
+    "````{margin}\n",
+    "My margin content\n",
+    "```{attributiongrey} Attribution\n",
+    ":class: attribution\n",
+    "Written by Tom van Woudenberg\n",
+    " \n",
+    "This page reuses CC BY content from {cite:t}`sympy`. {fa}`quote-left`[Find out more here](external_resources)\n",
+    "```\n",
+    "````\n",
+    "\n",
     "SymPy is a Python library for symbolic mathematics. You can use it as a tool to evaluate basic and complicated math operations, whenever they become tedious or error prone.\n",
     "\n",
     "```{custom_download_link} ./sympy_stripped.ipynb\n",