Code Lab Feedback

Hey @chrisvfritz, can you take a look at this? It's [hosted here]() and meets the following [project](http://lansingcodelab.com/lessons/css-intro/1) criteria:
- [x] include at least one instance of each of the following properties: `margin`, `padding`, `border`, `color`, `background`, `font-size`, `line-height` (properties must have a visible effect)
- [x] return no errors (warnings are OK) when the HTML document is uploaded to the [W3C Markup Validation Service](http://validator.w3.org/#validate_by_upload)
- [x] return no errors or warnings when contents of your CSS are pasted into [CSS Lint](http://csslint.net/)

The hosted submission link is empty, so there is no file or entry point to inspect. Start with the CSS Intro lesson criteria at http://lansingcodelab.com/lessons/css-intro/1, then check the submitted HTML with the W3C Markup Validation Service and the CSS with CSS Lint once a submission is available. Done means providing feedback on whether all listed criteria pass.

Written by the indexing model from the issue text.