In the code below, I am only getting a box around part of my equation like this:
How do I get the box to appear around the full equation? Thanks!
CODE
\documentclass{article}
\usepackage{mathtools}
\usepackage{unicode-math}
\begin{document}
\fbox{
$
\zeta\nearrow
\underset
{\mathrlap{\displaystyle\Searrow\text{ overshoot}\searrow}}
{\mathrlap{\Rightarrow\text{P.M.} \nearrow}}
$
}
\end{document}