# Box to appear fully around equation

Add a phantom.

```
\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}}
\hphantom{\Searrow\text{ overshoot}\searrow}$
}
\end{document}
```

The problem is due to the use of `\mathrlap`

. Here is another approach, based on the `eqparbox`

package and a simple `\boxed`

command:

```
\documentclass{article}
\usepackage{mathtools}
\usepackage{unicode-math}
\usepackage{eqparbox}
\newcommand{\eqlmathbox}[2][M]{\eqmakebox[#1][l]{$\displaystyle#2$}}
\begin{document}
$ \boxed{%
\zeta\nearrow \underset {\eqlmathbox{\displaystyle\Searrow\text{ overshoot}\searrow}}%
{\eqlmathbox{\Rightarrow\text{P.M.} \nearrow}}
}$
\end{document}
```