剥离（标题页有白线）

Question

我需要帮助删除标题页中的条纹（如图所示）。绘制此条纹的标题页部分是：

\begin{titlepage}
\definecolor{blue}{rgb}{0.0, 0.5, 0.69}
\raggedleft
\begin{tikzpicture}[remember picture,overlay]
  \node[yshift=2cm] at (current page.west)
  {\begin{tikzpicture}[remember picture,overlay]
 \draw[fill=blue, line width=0] (0,0)
    rectangle (\paperwidth, 3cm);
    \node[anchor=east, yshift=1.6cm, xshift=\paperwidth-1in, text=white]%
      {\bfseries\fontsize{25}{0}\selectfont \hspace{-4cm} Matematikk};
  \end{tikzpicture}};
\end{tikzpicture}

\vspace*{110pt}

 {\Large \bf Støttebok - Matematikk \\ {\large (programmeringsdel med MATLAB)} \\}\par \par \par \par 
\vspace*{5pt}

{\large  Oppsummering med eksempler og kontrolloppgaver}\par \par 

\end{titlepage}

整个代码如下，上面读取的是 titlepage1.tex 页面。

\documentclass[11pt,a4paper,norsk,openany]{book}
\renewcommand{\baselinestretch}{1} 
\usepackage{epstopdf} 
\makeatletter
\renewcommand*{\numberline}[1]{\hb@xt@3em{#1\hfil}}
\makeatother
\usepackage{enumerate} 
\usetikzlibrary{positioning}
\usepackage{relsize}
\usetikzlibrary{shadings}
\usepackage{pgfplots}
\pgfplotsset{compat=1.16}
\usepgfplotslibrary{fillbetween,decorations.softclip}
\pgfplotsset{compat = newest}
\usepackage{titlesec}
\usepackage{tikz-cd}
\usetikzlibrary{shapes.geometric,tikzmark,fit}
\usepackage{tkz-euclide}
\usepackage{booktabs}


\begin{document}

\clearpage

\input{./titlepage1.tex}

\end{document}