[Official] New CSS theme

Now we have hit 25,000 subscribers, here is the new CSS update as requested...

The new features are:

1. Header - Thanks to persian_x for helping with the design.

2. Sidebar - including quick link buttons to important information

3. Minor colour tweaks

4. Spoiler tags - this can be activated in comments using [Whatever you want to say] then (/spoiler)

5. Spoiler and Rules notice on submission page

6. Downvote pop up reminder

If any of you see any good CSS features on any other subreddit message me so I can take a look, if its any good we may implement it.

Hope you all like it, if not I'm sure you will tell me.