a less jarring color

examples/notebooks/Part 1 - Running Code.ipynb

@@ -40,7 +40,7 b''
       "var hl = function (id, on){\n",
       "    $(id)[0].style.background = '';\n",
       "    if (on) {\n",
-      "        $(id)[0].style.background = 'gold';\n",
+      "        $(id)[0].style.background = 'lightcyan';\n",
       "    }\n",
       "};\n",
       "</script>\n",