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I would like to add a soft drop shadow to this node (holding text):

\usetikzlibrary{fit,shapes,shadows,fadings,patterns,calc,positioning}%

\begin{tikzpicture}

\node[shape=rectangle,fill=white,inner xsep=.5cm,inner ysep=.5cm,text width=5cm,text depth=1\textheight](box){Text goes here (actually, a minipage)};

\end{tikzpicture}


I understand that I can add a simple drop-shadow simply adding the option dropshadow, but how do I make it fuzzy, and how do I control the radius of the fuzziness and the x,y offsets from the node 'box'?

I have tried to emulate the effect with a rectangle positioned to the right of the node, using the options color=black,shape fading=east, but it ends up completely transparent.

(Yes, I'm a complete tikz newbie.)