Nvm, I figured it out by pasting the following code into the CSS:
.single-jetpack-portfolio .entry-header, .page-header, .single-jetpack-portfolio .entry-content, .page-content, .page .entry-meta, .single-jetpack-portfolio .entry-meta, .comments-area, .post-navigation, .posts-navigation {
margin-right: auto;
margin-left: auto;
width: 1000px;
}
I just swapped out the default width of 660px with my desired width. Hope that helps others ??
