Change line height of h1 headlines

Hi, I’m trying to adjust the line height of my h1 headline. I’ve tried entering this in the Custom CSS:

h1 {
line-height: 60px;
padding: 0 20px 0 0;
}

But it didn’t work. This is an example of the headline I’m trying to change: https://www.12minuteathlete.com/fitter-faster-stronger/

And this is what I actually want the h1 headlines to look like: https://www.12minuteathlete.com/about/

Any ideas?