Theme Aligned to Left of Page

I recently decided to change the theme of my site to Twenty Fourteen but everything on the page is aligned to the left of the page and there’s a big gap on the right side.

I’ve tried changing the margins, but nothing worked. Here’s the body part from style.

body
{
border: 0;
font-family: inherit;
font-size: 100%;
font-style: inherit;
font-weight: inherit;
margin: 0;
outline: 0;
padding: 0;
vertical-align: baseline;
}