\setupbodyfont[pagella]

\starttext

\startTEXpage[offset=1ex,background=color,backgroundcolor=darkgray,align=middle]
  \ifcase\contextlmtxmode
    {\red    Welcome}
    {\white  to}
    {\blue   \ConTeXt}
    {\orange \MKIV}
  \else
    {\red    welcome}
    {\white  to}
    {\blue   context}
    {\orange lmtx}
  \fi
\stopTEXpage

\stoptext

