This is a trick about adding box shadow css to your blog or website. for example look at picture in left side.

Example shadow A shows a shadow offset to the left and top by 5px:

Example shadow B shows the same shadow with a blur distance of 5px:

Example shadow C shows the same shadow with a spread distance of 5px:

Example  shadow D shows the same shadow with both a blur distance of 5px and a spread distance of 5px:

Example shadow E shows a shadow with no offset and a blur distance of 5px:

Example shadow F shows a shadow with no offset and both a blur distance of 5px and a spread distance of 5px: