hi! i have a blog and i made the template of the blog myself, i use a laptop and my template looks perfectly fine, but whenever i use the computer, it would look like this (picture in additional details), i use a big computer (long width). how do i make it look like this blog? (2nd photo in additional details) i want it be in the middle like this one but still look the same when i use the laptop if that made sense. Im using html codes
1st picture (picture of my blog when using computer) http://i1057.photobucket.com/albums/t390/xSHIWEI/myblog_zpsd4234479.jpg

2nd picture (how i want my blog to look like when using these type of computers)
http://i1057.photobucket.com/albums/t390/xSHIWEI/xiaxueblog_zps448cdc2a.jpg