Add distance

Hi,

I’m trying move my sidebar a little down. As you can see, it needs to go a little down in order to look nice.

But if I do it via CSS, like this, the margin will be permanent, and it will look something like this if the title of another post is shorter than that one. As you can see, the margin now needs to be a little smaller.

How can I do so that the distance between the border below the title is always the same?

Thanks.