documentclass[final,20pt]{beamer}

usepackage[utf8]{inputenc}

usepackage{tcolorbox}
usepackage{url}
usepackage{paralist}
usepackage[font=large,labelfont=large,labelfont={color=red}]{caption}
usepackage[font=Large]{caption}
usepackage[font=Large]{subcaption}
usepackage{enumerate}
usepackage{xcolor}

newenvironment{myalign}{parnobreakLargenoindentalign}{endalign}
newenvironment{myalign2}{parnobreaklargenoindentalign}{endalign}
newenvironment{mygather}{parnobreakLargenoindentgather}{endgather}

usepackage{geometry}
geometry{paperwidth=841mm,paperheight=1189mm,hmargin=2cm}

setbeamertemplate{navigation symbols}{}
setbeamertemplate{headline}{}

fonttitlefont=cmr12 at 105pt
fontauthorfont=cmr12 at 40pt
fontinstitutefont=cmr12 at 40pt



definecolor{blue}{rgb}{0,0,1}
setbeamercolor{background canvas}{blue}


begin{document}
begin{frame}{}


    end{frame}
    end{document}