UI Options depends upon Fluid Skinning System (FSS) and the Infusion Framework, so you will need to add to your pages dependencies for

In the header of the file, link to the FSS CSS files with <link> tags (you'll likely have to adjust the paths to reflect where you've saved the Infusion package).

<!-- Required CSS files -->
<link rel="stylesheet" type="text/css" href="framework/fss/css/fss-layout.css" />
<link rel="stylesheet" type="text/css" href="framework/fss/css/fss-text.css" />
<link rel="stylesheet" type="text/css" href="components/uiOptions/css/fss/fss-theme-bw-uio.css" />
<link rel="stylesheet" type="text/css" href="components/uiOptions/css/fss/fss-theme-wb-uio.css" />
<link rel="stylesheet" type="text/css" href="components/uiOptions/css/fss/fss-theme-by-uio.css" />
<link rel="stylesheet" type="text/css" href="components/uiOptions/css/fss/fss-theme-yb-uio.css" />
<link rel="stylesheet" type="text/css" href="components/uiOptions/css/fss/fss-text-uio.css" />