\documentclass[twoside,a4paper]{article}

\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{booktabs}
\usepackage{enumitem}
\usepackage{fancyhdr}
\usepackage{float}
\usepackage{fontspec}
\usepackage{hyperref}
\usepackage[margin=2cm,includefoot,footskip=1.5cm]{geometry}
\usepackage{graphicx}
\usepackage{minted}
\usepackage{tikz}
\usepackage{url}

\usetikzlibrary{calc}
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}

%\setmainfont[BoldFont=OpenSans-Bold, ItalicFont=OpenSans-Italic, Ligatures=TeX]{OpenSans-Regular.ttf}
%\setsansfont[BoldFont=OpenSans-Bold, ItalicFont=OpenSans-Italic, Ligatures=TeX]{OpenSans-Regular.ttf}

\newfontfamily\Roboto[BoldFont=Roboto-Bold, Ligatures=TeX]{Roboto-Regular}
\setmainfont[BoldFont=Roboto-Bold, ItalicFont=Roboto-Italic, Ligatures=TeX]{Roboto-Regular}
\setsansfont[BoldFont=Roboto-Bold, ItalicFont=Roboto-Italic, Ligatures=TeX]{Roboto-Regular}

\definecolor{background}{RGB}{58,46,86}
\definecolor{border}{RGB}{234,211,186}

\patchcmd{\section}{\thispagestyle{plain}}{\thispagestyle{fancy}}{}{}

\pagestyle{fancy}
\fancyhf{}
\fancyhead[C]{%
\begin{tikzpicture}[overlay, remember picture]%
    \fill[border] (current page.north west) rectangle ($(current page.north east)+(0,-1.5cm)$);
    \fill[background] (current page.north west) rectangle ($(current page.north east)+(0,-1.4cm)$);
    \node[anchor=north west, text=white, font=\Large\Roboto, minimum size=1.4cm, inner xsep=5mm] at (current page.north west) {\textbf{white}box};
\end{tikzpicture}
}
\fancyfoot[LE,RO]{\thepage}

\newcommand\fancytitlecover {
	\begin{tikzpicture}[remember picture, overlay, shorten >= -10pt]
    \fill[border] (current page.north west) rectangle (current page.south east);
    \fill[background] (current page.north west) rectangle ($(current page.south east)+(0,3mm)$);
	\end{tikzpicture}
}

\makeatletter
\renewcommand*{\maketitle}{
	\begin{titlepage}
	\fancytitlecover
	\color{white}
	\begin{center}
	\sffamily
	\vspace*{3cm}
	\huge \@title \\[1em]
	{\Large\Roboto \textbf{white}box}
	\vfill
	%\large \@author \\[1em]
	%\large \@date
	\end{center}
	\end{titlepage}
}
\makeatother


\begin{document}

\title{Trusted Boot Module \\[.5em]
\Large User Manual}
\author{}
\date{}
\maketitle

\tableofcontents
\newpage

\section{Introduction}
\end{document}