Center vertical and horizontal

Hey there,

Im sorry, i’ve been asking a lot today.

(im having trouble uploading photos to this topics so ill add link to the pics)

Is there a way to center vertically and horizontally a title http://imgur.com/JTA3qrg,PcqqbAZ,MAEeRI0#0 i want the name centered. The problem is that if i add margins in my cellphone it looks like this http://imgur.com/JTA3qrg,PcqqbAZ,MAEeRI0#2

In my same page when im in my phone the video gets cutout of the screen, is there a way it could fit the screen? http://imgur.com/JTA3qrg,PcqqbAZ,MAEeRI0#3

Thank you very much for all your help!