%% this code comes from tColorbox Documentation Section 10.2.3 Page 153
\newtcolorbox{BoxRafa}[2][]
{enhanced,
before skip=2mm,after skip=2mm,
colback=yellow!20!white,colframe=black!50,boxrule=0.2mm,
attach boxed title to top right =
    {xshift=-0.6cm,yshift*=1mm-\tcboxedtitleheight},
    varwidth boxed title*=-3cm,
    boxed title style={frame code={
                        \path[fill=tcbcolback!30!black]
                            ([yshift=-1mm,xshift=-1mm]frame.north west)
                            arc[start angle=0,end angle=180,radius=1mm]
                            ([yshift=-1mm,xshift=1mm]frame.north east)
                            arc[start angle=180,end angle=0,radius=1mm];
                        \path[left color=tcbcolback!60!black,right color = tcbcolback!60!black,
                            middle color = tcbcolback!80!black]
                            ([xshift=-2mm]frame.north west) -- ([xshift=2mm]frame.north east)
                            [rounded corners=1mm]-- ([xshift=1mm,yshift=-1mm]frame.north east)
                            -- (frame.south east) -- (frame.south west)
                            -- ([xshift=-1mm,yshift=-1mm]frame.north west)
                            [sharp corners]-- cycle;
                            },interior engine=empty,
                    },
fonttitle=\bfseries\sffamily,
title={#2},#1}
%---------------------