\documentclass[a4paper,12pt,oneside]{book}
\usepackage[utf8]{inputenc}

\usepackage[dutch]{babel}

\usepackage{graphicx}

% Colour
\usepackage{xcolor}
\definecolor{fnwi}{RGB}{114, 3, 105}

% Text formatting
\usepackage{parskip}
\usepackage{stix2}
\usepackage{url}
% \usepackage[none]{hyphenat}
% \usepackage{ragged2e}
\setcounter{secnumdepth}{0}
\usepackage{hyperref}


\usepackage{transparent}
\usepackage{eso-pic}

% Header
\usepackage{fancyhdr}
% \usepackage[Sonny]{fncychap}
\usepackage{titlesec}

\titleformat{\chapter}[display]   
{\normalfont\huge\bfseries}{\color{fnwi} \chaptertitlename\ \thechapter}{20pt}{\Huge}   
\titlespacing*{\chapter}{0pt}{-20pt}{40pt}

\pagestyle{fancyplain}
\fancyhf{}
\fancyhead[LO]{
\includegraphics[width=0.4\textwidth]{logoh.png}
}
\fancyhead[RE]{\textsc{\footnotesize Facultaire Studentenraad der Faculteit der\\ Natuurwetenschappen, Wiskunde en Informatica}\\
\vspace{-0.35cm}\rule{0.65\textwidth}{0.1px}\\
Beleidsplan 2020-2021}
\fancyfoot[LE,RO]{\thepage}
\renewcommand{\headrulewidth}{2pt}
\renewcommand{\headrule}{\hbox to\headwidth{
    \color{fnwi}\leaders\hrule height \headrulewidth\hfill}}

%%%%%%%%%%%%%
%% ZET HIER PACKAGES DIE JE NODIG HEBT



%%%%%%%%%%%%%


\begin{document}

\begin{titlepage}
\setcounter{page}{0}
\begin{center}

\includegraphics[width=0.8\textwidth]{logov.png}

\vspace{0.5cm}

\rule{0.7\textwidth}{2px}

{\huge Beleidsplan 2020-2021}

\rule{0.7\textwidth}{2px}

\AddToShipoutPicture*{
    \put(0,0){
        \parbox[b][\paperheight]{\paperwidth}{%
            \vspace{12cm}
            \centering
            {\transparent{0.4}\includegraphics[width=\textwidth]{Amsterdam_science_park.jpg}}%
            \vfill
        }
    }
}

\end{center}
\end{titlepage}

\end{document}
