There's a way to make itemize bullet blue as the text? Only color, no shadow
\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[italian]{babel}
\usepackage[
a4paper,
margin=15mm,
bindingoffset=2mm,
heightrounded,
]{geometry}
\usepackage{amsmath}
\usepackage{microtype}
\usepackage{xcolor}
\usepackage{varwidth}
\usepackage{enumitem}
\usepackage{hyperref}
\DeclareMathOperator{\sen}{sen}
\begingroup\setlength{\fboxsep}{2pt}
\colorbox{white}{%
\begin{varwidth}[t]{\textwidth}
INTEGRALI
\begin{itemize}[leftmargin=*]
\item $\int a\, dx = ax$
\item \textcolor{blue}{$\int x^{n}\, dx = \dfrac{1}{n}x^{n+1}$}
\item $\int \cos x\, dx = \sen x$
\item \textcolor{blue}{$\int \sen x\, dx = -\cos x$}
\item $\int \dfrac{1}{x}\, dx = \ln x$
\item \textcolor{blue}{$\int \ln x\, dx = \int \ln x \cdot 1\, dx $}
\item $\int f'[g(x)] \cdot g'(x)\, dx = f[g(x)] + c$
\item \textcolor{blue}{$\int f(x) \cdot g'(x)\, dx = f(x) \cdot g(x) - \int f'(x) \cdot g(x)\, dx $}
\end{itemize}
\end{varwidth}%
}\endgroup
\end{document}