Can anyone tell me how to fix this???

[DonMoino]

Hello there! I got Blender yesterday and made an intro that looked cool (it was in 720p), but when I made it in 1080p this black "box" thing came in the middle of the video and ruined everything, can anyone tell how to remove it please???

The "box" is transparent and I guess that its a part of the template that I use.

 

[KatyAdelson]

I moved this to the video editing forum. ^^

Perhaps it's the aspect ratio? YouTube uses 16:9 aspect ratio. ^^
https://support.google.com/youtube/answer/6375112?hl=en