Cfrgtkky

I am in the beamer class, and using tikz. I want to use a color from the xcolor package, but am not able to get it working. Here is my preamble.

documentclass[usenames, dvipsnames]{beamer}

usepackage[utf8]{inputenc}

usepackage[T1]{fontenc}

usepackage{libertine}

%usepackage[font={small}, labelfont=bf]{caption}

%usepackage{subcaption}





usetheme{Cuerna}



%usepackage{amsmath,commath,amssymb,amsthm,blkarray}

%usepackage{bbm}

%usepackage{mathtools}

%usepackage{booktabs}

%usepackage{array}





%usepackage{siunitx}

%newcommand{imp}[1]{textbf{#1}}

%renewcommand{vv}[1]{mathbf{#1}}

%DeclareMathOperator{inff}{inf ;}

%DeclareMathOperator{supp}{sup ;}

usepackage{tikz}

usepackage{pgfplots}

%usepackage{physics}

addtobeamertemplate{navigation symbols}{}{%

usebeamerfont{footline}%

usebeamercolor[fg]{footline}%

hspace{1em}%

insertframenumber/inserttotalframenumber

}



setbeamercolor{itemize item}{fg=midnightblue}

setbeamertemplate{itemize items}{begin{tikzpicture}

shade[ball color=midnightblue!50!white, preaction={fill=black,

opacity=.25,transform canvas={xshift=1mm,yshift=-1mm, yscale=0.5}}] (0,0)      circle (0.6ex);

end{tikzpicture}}

title{Project}

author{Name}

begin{document}



begin{frame}

 titlepage

end{frame}



section{Introduction}

begin{frame}

begin{itemize}

    item something random

end{itemize}

end{frame}

end{document}

I have seen similar questions, but none of the suggestions have worked, such as loading in the package xcolor explicitly, or changing the order of when it is loaded.

• if you want to pass options to the xcolor package, use xcolor={usenames, dvipsnames}




• the name of the colour is MidnightBlue not midnightblue




• there is a missing } at the end of addtobeamertemplate{navigation symbols}{}{}% (in its current form this command does nothing...)




• renewcommand{vv}[1]{mathbf{#1}} won't work because vv is not defined previously

documentclass[xcolor={usenames, dvipsnames}]{beamer}

usepackage[utf8]{inputenc}

usepackage[T1]{fontenc}

usepackage{libertine}

usepackage[font={small}, labelfont=bf]{caption}

usepackage{subcaption}





usetheme{Cuerna}



usepackage{amsmath,commath,amssymb,amsthm,blkarray}

usepackage{bbm}

usepackage{mathtools}

usepackage{booktabs}

usepackage{array}





usepackage{siunitx}

newcommand{imp}[1]{textbf{#1}}

newcommand{vv}[1]{mathbf{#1}}

DeclareMathOperator{inff}{inf ;}

DeclareMathOperator{supp}{sup ;}

usepackage{tikz}

usepackage{pgfplots}

usepackage{physics}

addtobeamertemplate{navigation symbols}{}{}%



setbeamercolor{itemize item}{fg=MidnightBlue}

setbeamertemplate{itemize items}{begin{tikzpicture}

shade[ball color=MidnightBlue!50!white, preaction={fill=black,

opacity=.25,transform canvas={xshift=1mm,yshift=-1mm, yscale=0.5}}] (0,0)      circle (0.6ex);

end{tikzpicture}

}



begin{document}



begin{frame}

content...



begin{itemize}

item test

end{itemize}

end{frame}





end{document}