I'm trying to create a Navigation field for my website, and I would like my buttons to be underneath each other with a white line in between. I have managed to get this part working by adding two line breaks next to the button, as seen here:

```
<button id = "next" onclick="next()">
    Volgende
</button><br><br>

```

I'm wondering if it's possible to have them show up like this, but if I hide the button, have the other buttons jump up, so they fill the gap and jump back down when the button becomes visible again.

Thanks in advance!