Line-Height of H2 Sub-Headline?

I can’t find the correct CSS Code, to specificy for ALL H2 SUB-HEADLINES the LINE-HEIGHT?

How the heck can you do that?

Here is the link to the page I am talking about:
http://stillinmotion.com/sub/

And here is the VIDEO that explains the issue:
https://youtu.be/zrXQrftEn-Y

Hello there,

To override the default line height for all H2 sub-headlines, you can use the below custom CSS code:


.sow-sub-headline {
  line-height: 1em !important;
}

Regards,
Kharis