Greetings!
Not too difficult to do, but you will need to add some custom CSS code by using a plugin like “Simple Custom CSS”, or, if you are using Jetpack, you can use their own Custom CSS feature.
This is what the theme’s default styling is:
#sidebar-left .widget, #sidebar-right .widget {
margin: 0 0 3em;
}
So for you, changing the margin: 0 0 3em;
to your own is all that is needed. So you could do something like:
#sidebar-left .widget, #sidebar-right .widget {
margin: 0 0 2em;
}
2em = 32 pixels (you can use this online tool to convert https://www.pxtoem.com
Also, the 2em references the bottom margin, while the 0 0 represents the top margin and left and right margins. You could do it this way as well:
margin: 0 0 2em 0;
That does the same thing and translates to the top margin as 0, the right as 0, the bottom as 2em, and the left margin as 0. In that order.