tcolorbox 在投影仪的幻灯片上留下褪色的数字

Question

这冒犯代码是

\tcbset{colframe=blue!75!black,fonttitle=\bfseries,
    colback=green!5!white,
    every box/.style={enhanced,%watermark text=\thetcblayer,
        before=\par\smallskip,after=\par\smallskip},
    every box on layer 2/.style={reset,every box,colback=yellow!10!white,
        drop fuzzy shadow}}

即watermark text=\thetcblayer，表示背景中有水印，在本例中为 tcolorbox 图层编号。如果不想要，则应将其删除。

\documentclass[slides]{beamer}
%\documentclass[a4wide,8pt]{extarticle}
\mode<presentation>{}

%Define usepackages
\usetheme{default}
\usepackage[utf8]{inputenc}
\usepackage{amsfonts}
\usepackage{graphicx}                                   % for pdf, bitmapped graphics files
\usepackage{times}                                       % assumes new font selection scheme installed
\usepackage{amsmath}                                    %assumes amsmath package installed
\usepackage{amssymb} 
\usepackage{amsfonts}                                    % assumes amsmath package installed
%\usepackage{color}

\usepackage{commath}

\usepackage{breqn}

\usepackage{tcolorbox}

\usepackage{hyperref}
\hypersetup{linkbordercolor=green}



%Define colors
%\definecolor{blue}{rgb}{0,0,1}  



% %preamble and title page
\setbeamersize{text margin left = 0.2mm}
\setbeamersize{text margin right = 0.2mm}
\setbeamersize{sidebar width left= 0.3mm}
\setbeamersize{sidebar width right= 0.3mm}

\setbeamertemplate{itemize item}[triangle]
\setbeamertemplate{itemize subitem}[triangle]


%\setbeamercovered{transparent}
%\setbeamertemplate{navigation symbols}{}
%\setbeamertemplate{headline}


\tcbuselibrary{skins,breakable}

% Color Box layers
\tcbset{colframe=blue!75!black,fonttitle=\bfseries,
    colback=green!5!white,
    every box/.style={enhanced,%watermark text=\thetcblayer,
        before=\par\smallskip,after=\par\smallskip},
    every box on layer 2/.style={reset,every box,colback=yellow!10!white,
        drop fuzzy shadow}}

% Newt Color Box
\newtcolorbox{pabox}[1]{colback=red!5!white,
    colframe=green!75!black,fonttitle=\bfseries,
    title=#1}

%My green box
\newtcolorbox{mygreenbox}[2][]{%
    enhanced,width=\linewidth-6pt,
    enlarge top by=3pt,enlarge bottom by=3pt,
    enlarge left by=3pt,enlarge right by=3pt,
    title={#2},frame hidden,boxrule=0pt,top=1mm,bottom=1mm,
    colframe=green!30!black, colbacktitle=green!50!yellow,
    coltitle=black, colback=green!25!white,
    borderline={0.5pt}{-0.5pt}{green!75!blue},
    borderline={1pt}{-3pt}{green!50!blue},#1}


\begin{document}

\long\def\/*#1*/{}                              % Define block comment
    % This starts Page 3
    \begin{frame}{\textcolor{cyan}{\small Non-Lipschitzian Dynamics of a Continuous FTS Feedback Controller}}

        \begin{tcolorbox}[title = \small Overview of Problem]
            \begin{itemize}
            \item\tiny\color{blue}  The design of FTS continuous time-invariant feedback controllers involve non-Lipschitzian closed-loop dynamics
            \item Such controllers will exhibit non-unique solutions in backward time, i.e.,  better robustness and good disturbance rejection
            \item Such non-unique (revert time) solutions would violate uniqueness conditions for Lipschitz differential equations
            \end{itemize}


        \begin{pabox}{\small Statement of Problem}
            \begin{itemize}
                \item\tiny\color{blue}  Consider a rigid body rotating under the action of a mechanical torque about a fixed axis
                \item Its equations of motion resemble those of a double integrator. States differ by $2n\pi$ (where $n = 0, 1, 2, \hdots$) in angular modes which correspond to the same physical configuration of the body.
                \item State space for this system is $S^1 \times \mathbb{R}$ rather than $ \mathbb{R}^2$ \cite{Andronov}
                \item Developing stabilizing controls for the double integrator on $ \mathbb{R}^2$ (translational double integrator) will lead to unwinding since the configuration space is actually $ \mathbb{R}$
                \item  This makes an interesting problem when designing feedback controllers for the rotational double integrator with anti-wind-up compensation
                \item Discontinuous feedback controllers are practically infeasible due to the chattering they introduce because of plant uncertainties
                \item They could also excite high-frequency dynamics when used in controlling lightly damped structures \cite{Baruh et. al.}
            \end{itemize}
        \end{pabox}

    \end{tcolorbox}

\end{frame}
\end{document}

编辑

我删除了一些不必要的代码/语句，例如，\usepackage{xcolor}因为它已经被tcolorbox和加载\definecolor{blue}，因为blue它已经是一种众所周知的颜色。

声明\color{cyan}已改为\textcolor{cyan}{...}

在此处输入图片描述

Answer 1