Change Widget Box Size

Hello,
Let me start by saying I’m not great at coding. My site was designed by someone else and for the most part anything I need to edit is fine. Except the side bar, the widget boxes come in at a standard size and if I put too much content in them it gets cut off and I can’t find where in the style sheet to change the height of the box.

Here is the example:
https://www.movewithmargo.com/about-oakland-county-realtor/

You see the “property search” is a nice long box (that’s one of the ones left from when they designed by site). If I put in a new box it comes out a standard size (notice how the “follow us” box has a bunch of dead space, I’d like to reduce the height of that box and remove the dead space, and be able to increase the size of the other boxes to add more stuff.

Any help / ideas would be appreciated. I am using the genesis theme if that makes a difference.