Liz,
Just realized that the snippet is stripping out styles. Here's how you can get the same result -
Add your style block in the custom HTML HEAD section of the "Edit Page meta tags" dialog as shown below -
![0EM50000000QFOk.jpg 0EM50000000QFOk.jpg](/t5/image/serverpage/image-id/7010iBE92968A3898C25B/image-size/large?v=v2&px=999)
Create snippet without style as shown below -
![0EM50000000QFOp.jpg 0EM50000000QFOp.jpg](/t5/image/serverpage/image-id/6980iE618AD7197D3C7EE/image-size/large?v=v2&px=999)
Place the snippet on the Landing Page (LP) and you will see the styles. Here's my example LP with your style http://na-qe.marketo.com/lp/socialoct/raj_regression_LPWithSnippetStyle.html