I want to have a slide in beamer with itemize exposing new line on each click while at the bottom part of the slide there are some equations. This is my attempt

```
\begin{frame}
\begin{overprint}{\textwidth}
\leavevmode
\begin{itemize}[<+->]
\item <1-> Poisson Boltzman equation (PB)
\item <2-> Debye-H\"uckle equation (DH)
\item <3-> The naive approach - applying (DH) equation to PE
\end{itemize}
\end{overprint}
\begin{tikzpicture}
\node at (0,0) {};
\node<1,2> [text width = 20cm]at (10.5,-1) {$ \nabla^2 \phi =\sum_i \frac{n_i q_i\text{e}^{-q_i \phi/kT}}{4 \pi \epsilon}$};
\node <2> [text width = 20cm]at (10.5,-2) {$q_i \phi/kT \ll 1 \Rightarrow \nabla^2 \phi \simeq \kappa^2 \phi$};
\node <2> [text width = 20cm, font=\footnotesize]at (10.5,-2.5) {$\kappa^2 = \lambda^{-1/2} = \sum_i \frac{n_i q_i}{4 \pi \epsilon}$};
\node <3> [text width = 20cm] at(10.5,-1) {$\frac{F_{el}}{VkT} = - \left ( \frac{ 4 \pi e^2}{\epsilon kT}
\sum_{i=1} n_i z_i^2 \right )^{3/2} \left ( 12 \pi \right )^{-1}$};
\end{tikzpicture}
\end{frame}
```

However, the itemized line jump up and down between slides. I've tried to use `itemize`

without any environment surrounding it. I've also tried to use `overlayarea`

instead of `overprint`

. How can I keep the line position constant?

I've uploaded a gif animation to display this. On my machine it run really fast and I can't fix this. Hope the problem is understood.

When I run this, I get

## Best Answer

One possibility with

`overlayarea`

:By the way, your syntax for

`overprint`

is wrong; the width should be declared as an optional argument: