Ad is not horizontally centered in GameResults modal

[codergautam]

The ad on the Game Results or end screen isn't always horizontally centered. I've narrowed down the issue to this part of the code added in #23 :

https://github.com/codergautam/swordbattle.io/pull/23/commits/32e0d03e271a7515645f96605b4fe3cd95a42b16#diff-f2286f8bf2376694d9c87b819c26cc746048c6c82427ac6036418b9cf48389a3R56

Sometimes Adinplay serves ads smaller than the one we requested, for example a 728x90 when requesting a 970x90 ad. We need an accurate way of determining what the size of the ad being served is, so that it can be centered properly.

[terminator2299]

Hey , Can't we use mutation observer. And center the ad horizontally.