Page Content Alignment

Hello, So my site is http://shass.co.uk/blog If you take a look at the homepage everything is aligned nicely, however when visiting the other pages such as http://shass.co.uk/blog/?page_id=26 the content has moved to the right. I am still very new to Wordpress and I'm still learning so I may have incorrectly modified the stylesheet. I am using a child theme btw, which I have no experience in using before. SO pleaaase help me fix this. Thank you in advance :)