RadLightBox uses skins to control its overall look-and-feel. A skin is a set of images and a CSS stylesheet that can be applied to the control elements (items, images, etc.) and defines their look and feel. By default all controls in UI for ASP.NET AJAX suite have a polished look and feel which is consistent across the whole product line.
These are the skins provided by Telerik. They are embedded in the Telerik.Web.UI.Skins.dll assembly (except the Default one). To use a built-in skin the user only needs to set the Skin property of the control.
Below is a set of the Telerik RadLightBox skins:
The Material skin is available for the Lightweight RenderMode only. If you experience visual issues with it, make sure your controls are not using the default Classic mode.