I have the following tikz
picture.
\documentclass{standalone}
\usepackage{tikz}
\usepackage{xcolor}
\begin{document}
\begin{tikzpicture}[
arr/.style={->, blue, very thick},
lbl/.style={draw, blue, very thick},
]
\draw[fill=red, very thin] (-1,-1) rectangle (1,1);
\draw[arr] (-2,0) .. controls (-.75,-.25) and ( -.25,.75) .. (.5,0); % ARROW
\node[lbl, anchor=north west] at (.5,0) {}; % RECTANGLE
\end{tikzpicture}
\end{document}
How can I add a shadow under the blue rectangle?
How can I add a shadow that follows the blue arrow?