diff --git a/chatchart/chatchart.py b/chatchart/chatchart.py
index d337892..8553c07 100644
--- a/chatchart/chatchart.py
+++ b/chatchart/chatchart.py
@@ -19,40 +19,39 @@ class ChatChart:
 
     def __init__(self, bot):
         self.bot = bot
-
-    def create_chart(self, top, others):
+    def create_chart(self, top, others, channel):
         plt.clf()
         sizes = [x[1] for x in top]
         labels = ["{} {:g}%".format(x[0], x[1]) for x in top]
-        if len(top) >= 10:
+        if len(top) >= 20:
             sizes = sizes + [others]
             labels = labels + ["Others {:g}%".format(others)]
-
-        title = plt.title('User activity in the last 5000 messages')
+        title = plt.title("Stats in #{}".format(channel.name), color="white")
         title.set_va("top")
-        title.set_ha("left")
+        title.set_ha("right")
         plt.gca().axis("equal")
-        colors = ['r', 'darkorange', 'gold', 'y', 'olivedrab', 'green', 'darkcyan', 'mediumblue', 'darkblue', 'blueviolet', 'indigo']
+        colors = ['#7e1e9c', '#15b01a','#0343df','#ff81c0','#653700','#e50000','#95d0fc','#029386','#f97306','#96f97b','#c20078','#ffff14','#75bbfd','#929591','#89fe05','#bf77f6','#9a0eea','#033500','#06c2ac','#c79fef','#00035b','#d1b26f','#00ffff','#13eac9']
         pie = plt.pie(sizes, colors=colors, startangle=0)
         plt.legend(pie[0], labels, bbox_to_anchor=(0.7, 0.5), loc="center", fontsize=10,
-                   bbox_transform=plt.gcf().transFigure)
+                   bbox_transform=plt.gcf().transFigure, facecolor='#ffffff')
         plt.subplots_adjust(left=0.0, bottom=0.1, right=0.45)
         image_object = BytesIO()
-        plt.savefig(image_object, format='PNG')
+        plt.savefig(image_object, format='PNG', facecolor='#36393E')
         image_object.seek(0)
         return image_object
 
     @commands.command(pass_context=True)
     @commands.cooldown(1, 10, commands.BucketType.channel)
-    async def chatchart(self, ctx):
+    async def chatchart(self, ctx, channel: discord.Channel=None):
         """
-        Generates a pie chart, representing the last 5000 messages in this channel.
+        Generates a pie chart, representing the last 5000 messages in the specified channel.
         """
-        channel = ctx.message.channel
         e = discord.Embed(description="Loading...", colour=0x00ccff)
         e.set_thumbnail(url="https://i.imgur.com/vSp4xRk.gif")
         em = await self.bot.say(embed=e)
-
+		
+        if channel is None:
+            channel = ctx.message.channel
         history = []
         async for msg in self.bot.logs_from(channel, 5000):
             history.append(msg)
@@ -73,14 +72,14 @@ class ChatChart:
             pd = float(msg_data['users'][usr]['msgcount']) / float(msg_data['total count'])
             msg_data['users'][usr]['percent'] = round(pd * 100, 1)
 
-        top_ten = heapq.nlargest(10, [(x, msg_data['users'][x][y])
+        top_ten = heapq.nlargest(20, [(x, msg_data['users'][x][y])
                                       for x in msg_data['users']
                                       for y in msg_data['users'][x]
                                       if y == 'percent'], key=lambda x: x[1])
         others = 100 - sum(x[1] for x in top_ten)
-        img = self.create_chart(top_ten, others)
+        img = self.create_chart(top_ten, others, channel)
         await self.bot.delete_message(em)
-        await self.bot.send_file(channel, img, filename="chart.png")
+        await self.bot.send_file(ctx.message.channel, img, filename="chart.png")
 
 
 def check_folders():
@@ -91,4 +90,4 @@ def check_folders():
 
 def setup(bot):
     check_folders()
-    bot.add_cog(ChatChart(bot))
+    bot.add_cog(ChatChart(bot))
\ No newline at end of file