I'm not very good with the whole HTML/CSS coding, so I was hoping one of you ladies could help me out a bit.

I am currently trying to-
A. Center my profile
B. Change the size of the header to 650x371
I haven't had any luck so far.. any help appreciated. confused
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I wasn't sure whether to post the coding here or not, so I'll send the coding through a PM to whoever can help me out.