Two scroll bars

I am having this same issue on a website I am trying to update for a Minecraft server. www.hcserver.com The problem is I am having two scroll bars on the side. I did find in this site coding to fix this problem but looking at my .css I cannot figure out where to put the coding in to fix the issue. Can someone look at my coding and show me where exactly I have to add the rules to remove the extra scroll bar? Thank you.