diff --git a/content/01-demand/01-demand.ipynb b/content/01-demand/01-demand.ipynb
index bb9c58d..8747f57 100644
--- a/content/01-demand/01-demand.ipynb
+++ b/content/01-demand/01-demand.ipynb
@@ -1,5 +1,22 @@
 {
  "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['Solarize_Light2', '_classic_test_patch', '_mpl-gallery', '_mpl-gallery-nogrid', 'bmh', 'classic', 'dark_background', 'fast', 'fivethirtyeight', 'ggplot', 'grayscale', 'seaborn-v0_8', 'seaborn-v0_8-bright', 'seaborn-v0_8-colorblind', 'seaborn-v0_8-dark', 'seaborn-v0_8-dark-palette', 'seaborn-v0_8-darkgrid', 'seaborn-v0_8-deep', 'seaborn-v0_8-muted', 'seaborn-v0_8-notebook', 'seaborn-v0_8-paper', 'seaborn-v0_8-pastel', 'seaborn-v0_8-poster', 'seaborn-v0_8-talk', 'seaborn-v0_8-ticks', 'seaborn-v0_8-white', 'seaborn-v0_8-whitegrid', 'tableau-colorblind10']\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(plt.style.available)"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 1,
@@ -17,7 +34,7 @@
     "import matplotlib.pyplot as plt\n",
     "import matplotlib as mpl\n",
     "import matplotlib.patches as patches\n",
-    "plt.style.use('seaborn-muted')\n",
+    "# plt.style.use('seaborn-muted')\n",
     "%matplotlib inline\n",
     "\n",
     "from IPython.display import display\n",
@@ -88,7 +105,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 3,
    "metadata": {
     "tags": [
      "remove_input"
@@ -106,8 +123,8 @@
     "ardy = 0\n",
     "\n",
     "fig = plt.figure(figsize=[7,7])\n",
-    "plt.plot(xs, ys, label=\"Original Demand Curve\")\n",
-    "plt.plot(xs, ys2, label=\"Shifted Demand Curve\")\n",
+    "plt.plot(xs, ys, label=\"Original Demand Curve\", linestyle='-', linewidth=2)\n",
+    "plt.plot(xs, ys2, label=\"Shifted Demand Curve\", linestyle='--', linewidth=2)\n",
     "plt.arrow(arx, ary, ardx, ardy, head_width=0.8, head_length=0.5, length_includes_head=True)\n",
     "plt.xticks([])\n",
     "plt.yticks([])\n",
@@ -117,7 +134,8 @@
     "plt.ylim([-25, 10])\n",
     "plt.legend()\n",
     "fig.savefig('fig-01-demand-orig-shifted-demand.png', bbox_inches='tight')\n",
-    "plt.close(fig) \n"
+    "plt.close(fig)\n",
+    "plt.show()\n"
    ]
   },
   {
@@ -251,7 +269,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.12.1"
+   "version": "3.11.4"
   }
  },
  "nbformat": 4,