Content Alignment in Post

Hi,

I attempted to make my page full width using the entirety of the screen with:

.container{
width:100%;
}

This might not be accurate, so any additional insights here would be helpful.
The issue I have with this method is that my content in a single post is not aligned with the rest of the page. How can I correct this?

The page I need help with: [log in to see the link]