It may also be a matter of how DW is seeing the link:

<link href="styles/sms.css" rel="stylesheet" type="text/css">

can be stated

<link rel="stylesheet" href="/sms.css" type="text/css">

basically, lose "styles" unless that is a valid directory, which I don't think that it is, it's merely a DW inserted tag ...

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W. R. Mineo