quanghuy147 on "[Theme: Enigma] Decrease the width of the page"

Hi,
I would like to reduce the width of the page, now it is full width. How can I do that?

Also, I would like to change the color of the social icons. Please show me.

Here is my page scscenter.org
Thank you!

Also, I would like to put the Donate button on the header, please show me. Thank you Weblizar.