css basics: div #wrapper

Looks like I got out of sync with the flow here. I went back one lesson and rewrote the code, and have had no luck getting back on track.

I took screenshots of my site and Nick's, and they don't match. (borders, and color primarily)

Where can I upload these images to help out potential answers?

-related to <div> and naming of same element (<div id="wrapper">, and the lesson took us into editing the .css file. Here's what I have there:

a {
  text-decoration: none;
}

#wrapper {
  max-width: 940px;
  margin: 0 auto;
  padding:0 5%;
  background: orange;
}

But previously had:

#wrapper {
  max-width: 940px;
  margin: 0 auto;
}

If not mistaken, the last was supposed to line up image and text elements within the <div>.

Mine didn't, and I double-checked it, so now stuck.

Thanks in advance!