\documentclass{article}
\usepackage[demo]{graphicx} % Demo for MWE
\usepackage[margin=2cm]{geometry}
\usepackage{xcolor}
\usepackage{flowfram}
\usepackage{lipsum}
\usepackage{kantlipsum}
\usepackage{microtype}
\definecolor{infocolor}{RGB}{216,237,237}
\newflowframe{\dimexpr\textwidth/3}{\textheight}{0pt}{0pt}[leftcolumn]
\newflowframe[1]{\dimexpr\textwidth/3}{.2\textheight}{\dimexpr\textwidth/3+\columnsep}{0pt}[shortcentercolumn]
\newflowframe[1]{\dimexpr\textwidth/3}{.2\textheight}{\dimexpr2\textwidth/3+2\columnsep}{0pt}[shortrightcolumn]