How to make a full-width angled banner?

I'd like to make an custom environment for a page decoration like the following gray angled banner:

I'm unsure how to draw it so that it that goes the full width of the page. I don't have an high res-image for it, but I'd like to keep the two column style in the banner.

Here's the text:

Personalisation

A virtual personal tutor guides students through new topics, and gives real time hints and encouragement – almost like 1:1 coaching.

• The banner is not too difficult to get, however not many are keen on typing the text in. So could you please provide us with the code that produces the text without the banner? – marmot Nov 8 '18 at 18:34

Obviously I do not know how you do your twocolumn stuff. Is it a table or multicol, impossible to tell without an MWE. So here is a generic answer that can be applied to both. Obviously, I made no effort in punching in the text from your screen shot.

\documentclass{article}
\usepackage{multirow}
\usepackage{eso-pic}
\usepackage{tikz}
\usetikzlibrary{tikzmark,calc}
\usepackage{lipsum}
\begin{document}
\lipsum[1]

\bigskip\bigskip

\centering
\begin{tabular}{rl}
Personalization &
\multirow{2}{*}{\tikzmarknode{duck}{\includegraphics{example-image-duck}}}\\
some more text
\end{tabular}
($(current page.west |- duck.north)+(0,1)$)
-- ($(current page.east |- duck.north)+(0,0.1)$)
-- ($(current page.east |- duck.south)+(0,-0.1)$)
-- ($(current page.west |- duck.south)+(0,-1)$);