Changing the color of footer and tabs linking to previous posts

[Yashasvi191]

For #93

1. I think that the color of the navbar and footer should be kept same.

• This can be done by changing background-color to 323232 in
  .footer_top

2. Also , the border color of tabs for 2017 events and Register for an event can be changed to again
   the same color.

• This can be done by changing color and border color to 323232 in .prev_post.

Both these classes are in public/css/style.css file.

[lisa761]

Great work @Yashasvi191, the first point would be a great idea honestly. As for the second point, there is already someone who has mentioned changing it, although differently, but you can't be working on the same thing at the same time to avoid a merge conflict. But its a great idea in terms of uniformity.