我怎样才能改变这个 tcolorbox 里面的字体大小？

Question

我有一段用于定制 tcolorbox 的代码（我使用 XeTeX 进行字体管理）：

\documentclass[10pt, oneside]{book}
\usepackage[skins]{tcolorbox}
\tcbuselibrary{breakable} 
\usepackage{fontspec}
\setmainfont[Path=../../FONTES/,
    Variant=1,
    BoldItalicFont=cambriaz.ttc,
    BoldFont      =cambriab.ttc,
    ItalicFont    =cambriai.ttc]
    {cambria.ttc}

\newfontfamily\fonteverdana[Path=../../FONTES/,
    BoldItalicFont=verdanaz.ttf,
    BoldFont      =verdanab.ttf,
    ItalicFont    =verdanai.ttf]
    {verdana.ttf}

\usepackage{setspace}
\newenvironment{completa}[1][]{\fonteverdana\normalsize\par\addvspace{12pt plus1pt minus1pt}% 
\begin{tcolorbox}[enhanced, 
    breakable, 
    code={\onehalfspacing},
    center title,
    title = \fontsize{11}{13}\fonteverdana\textbf{SOLUTION}\vspace{-10pt},
    colback=yellow, 
    colframe=black, 
    boxrule=.7pt, 
    arc=0mm, 
    titlerule=0mm,
    colbacktitle=yellow, 
    coltitle=black, 
]{#1\par\vskip8pt}
}{\end{tcolorbox}%
\par\addvspace{9pt plus1pt minus1pt}}

\begin{document}    
\begin{completa}

Here I have a number, $2$. As it can be seen it's smaller than it should be. Here's another example:

$$2\times 4 = 8$$

I think that's probably happening because the font is big. But I can't find anyway of changing it. 
\end{completa}
\end{document}

当我编译它时，我注意到数学字体与正文相比变得太小了。有什么想法吗？我尝试以fontsize某种方式输入一些命令，但无法弄清楚。请参见下面的框：

Answer 1

这是使用软件包执行此操作的一种方法unicode-math 。这需要使用 OpenType 数学字体，这会在一定程度上限制您的选择。但由于您使用 Cambria 作为主要字体，因此我在此示例中使用了 Cambria Math。该unicode-math软件包允许您创建不同的数学版本，因此我们创建一个缩放以匹配 Verdana 的版本并在框中使用它。

\documentclass[10pt, oneside]{book}
\usepackage[skins]{tcolorbox}
\tcbuselibrary{breakable} 
\usepackage{amsmath}
\usepackage{fontspec}
\usepackage[math-style=TeX]{unicode-math}
\setmathfont{Cambria Math}[version=main]
\setmathfont{Cambria Math}[version=box,Scale=1.2]

%\setmainfont[Path=../../FONTES/,
%    Variant=1,
%    BoldItalicFont=cambriaz.ttc,
%    BoldFont      ˚=cambriab.ttc,
%    ItalicFont    =cambriai.ttc]
%    {cambria.ttc}
%
\setmainfont{Cambria}
\newfontfamily\fonteverdana[]{Verdana}
%\newfontfamily\fonteverdana[Path=../../FONTES/,
%    BoldItalicFont=verdanaz.ttf,
%    BoldFont      =verdanab.ttf,
%    ItalicFont    =verdanai.ttf]
%    {verdana.ttf}
\usepackage{setspace}

\newenvironment{completa}[1][]{\fonteverdana\normalsize\par\addvspace{12pt plus1pt minus1pt}% 
\begin{tcolorbox}[enhanced, 
    breakable, 
    code={\onehalfspacing\mathversion{box}},
    center title,
    title = \fontsize{11}{13}\fonteverdana\textbf{SOLUTION}\vspace{-10pt},
    colback=yellow, 
    colframe=black, 
    boxrule=.7pt, 
    arc=0mm, 
    titlerule=0mm,
    colbacktitle=yellow, 
    coltitle=black, 
]{#1\par\vskip8pt}
}{\end{tcolorbox}%
\par\addvspace{9pt plus1pt minus1pt}}
\mathversion{main}
\begin{document}  
Regular text:

\[2\times 4 = 8\]

Example text:
\begin{completa}

Here I have a number, $2$. As it can be seen it's \index{smaller} than it should be. Here's another example:

\[
2\times 4 = 8
\]

I think that's probably happening because the font is big. But I can't find anyway of changing it. 
\end{completa}
\end{document}