diff --git a/Diagrams.ipynb b/Diagrams.ipynb
index 9f02a07..d183509 100644
--- a/Diagrams.ipynb
+++ b/Diagrams.ipynb
@@ -22,6 +22,62 @@
   },
   {
    "cell_type": "code",
+   "execution_count": 164,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<style>body {\n",
+       "    margin: 0;\n",
+       "    font-family: Helvetica;\n",
+       "}\n",
+       "table.dataframe {\n",
+       "    border-collapse: collapse;\n",
+       "    border: none;\n",
+       "}\n",
+       "table.dataframe tr {\n",
+       "    border: none;\n",
+       "}\n",
+       "table.dataframe td, table.dataframe th {\n",
+       "    margin: 0;\n",
+       "    border: 1px solid white;\n",
+       "    padding-left: 0.25em;\n",
+       "    padding-right: 0.25em;\n",
+       "}\n",
+       "table.dataframe th:not(:empty) {\n",
+       "    background-color: #fec;\n",
+       "    text-align: left;\n",
+       "    font-weight: normal;\n",
+       "}\n",
+       "table.dataframe tr:nth-child(2) th:empty {\n",
+       "    border-left: none;\n",
+       "    border-right: 1px dashed #888;\n",
+       "}\n",
+       "table.dataframe td {\n",
+       "    border: 2px solid #ccf;\n",
+       "    background-color: #f4f4ff;\n",
+       "}\n",
+       "</style>"
+      ],
+      "text/plain": [
+       "<IPython.core.display.HTML object>"
+      ]
+     },
+     "execution_count": 164,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "from IPython.core.display import HTML\n",
+    "HTML('<style>{}</style>'.format(open('style-table.css').read()))"
+   ]
+  },
+  {
+   "cell_type": "code",
    "execution_count": 57,
    "metadata": {
     "collapsed": false
@@ -614,7 +670,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 31,
+   "execution_count": 161,
    "metadata": {
     "collapsed": false
    },
@@ -681,7 +737,7 @@
        "Howard Hawks     4         His Girl Friday  1940"
       ]
      },
-     "execution_count": 31,
+     "execution_count": 161,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -1758,6 +1814,77 @@
   },
   {
    "cell_type": "code",
+   "execution_count": 154,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div style=\"max-height:1000px;max-width:1500px;overflow:auto;\">\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th></th>\n",
+       "      <th>year</th>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>director</th>\n",
+       "      <th>title</th>\n",
+       "      <th></th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th rowspan=\"3\" valign=\"top\">Alfred Hitchcock</th>\n",
+       "      <th>North by Northwest</th>\n",
+       "      <td> 1959</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>Notorious</th>\n",
+       "      <td> 1946</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>To Catch a Thief</th>\n",
+       "      <td> 1955</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>George Cukor</th>\n",
+       "      <th>The Philadelphia Story</th>\n",
+       "      <td> 1940</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>Howard Hawks</th>\n",
+       "      <th>His Girl Friday</th>\n",
+       "      <td> 1940</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "                                         year\n",
+       "director         title                       \n",
+       "Alfred Hitchcock North by Northwest      1959\n",
+       "                 Notorious               1946\n",
+       "                 To Catch a Thief        1955\n",
+       "George Cukor     The Philadelphia Story  1940\n",
+       "Howard Hawks     His Girl Friday         1940"
+      ]
+     },
+     "execution_count": 154,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "df1.groupby(['director', 'title']).first()"
+   ]
+  },
+  {
+   "cell_type": "code",
    "execution_count": 134,
    "metadata": {
     "collapsed": false
@@ -1829,7 +1956,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 147,
+   "execution_count": 150,
    "metadata": {
     "collapsed": false
    },
@@ -1840,14 +1967,15 @@
        "812"
       ]
      },
-     "execution_count": 147,
+     "execution_count": 150,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
-    "open('_tyd.html', 'w').write(df1.to_html())\n",
-    "open('d_ty.html', 'w').write(df1.set_index('director').to_html())"
+    "open('u__tyd.html', 'w').write(df1.to_html())\n",
+    "open('u_d_ty.html', 'w').write(df1.set_index('director').to_html())\n",
+    "open('s_d_ty.html', 'w').write(df1.set_index('director').sort_index().to_html())"
    ]
   },
   {
diff --git a/style-table.css b/style-table.css
index cd21334..575cd88 100644
--- a/style-table.css
+++ b/style-table.css
@@ -1,18 +1,30 @@
 body {
     margin: 0;
-    color: blue;
     font-family: Helvetica;
 }
-table {
+table.dataframe {
     border-collapse: collapse;
     border: none;
 }
-td, th {
+table.dataframe tr {
     border: none;
+}
+table.dataframe td, table.dataframe th {
     margin: 0;
-    padding-left: 0.5em;
+    border: 1px solid white;
+    padding-left: 0.25em;
+    padding-right: 0.25em;
 }
-th {
+table.dataframe th:not(:empty) {
+    background-color: #fec;
     text-align: left;
-    color: red;
+    font-weight: normal;
+}
+table.dataframe tr:nth-child(2) th:empty {
+    border-left: none;
+    border-right: 1px dashed #888;
+}
+table.dataframe td {
+    border: 2px solid #ccf;
+    background-color: #f4f4ff;
 }
diff --git a/tmp.dot b/tmp.dot
index db3e884..65db435 100644
--- a/tmp.dot
+++ b/tmp.dot
@@ -3,9 +3,13 @@ digraph {
 node [label=""]
 edge [fontname="Ubuntu Light"; fontsize=12.0]
 
-_tyd [shape=none image="_tyd.png"];
-d_ty [shape=none image="d_ty.png"];
+u__tyd [shape=none image="u__tyd.png"];
+u_d_ty [shape=none image="u_d_ty.png"];
+s_d_ty [shape=none image="s_d_ty.png"];
 
-_tyd -> d_ty [label=" .set_index('director')"];
+u__tyd -> u_d_ty [label=" .set_index('director')"];
+u_d_ty -> s_d_ty [label=" .sort_index()"];
+
+u__tyd -> s_d_ty [label=" .set_index('director')"];
 
 }
\ No newline at end of file