Reduce Width of Blog Posts Using the Advanced Layout Editor

The width of my blog posts and pages has been limited to 760 pixels and looks great. This works for pages that use both the default and advanced editor. But it only works for posts that use the default editor.
However, when I use the advanced editor, the width of my blog post is full-width.
Here is the code I use:
#top .fullsize .template-blog .post .entry-content-wrapper>* {
max-width: 760px;
margin-left: auto;
margin-right: auto;
}
Do I need to add anything for when I use the advanced editor for blog posts?