Reduce white space margin at the top of the site content.

Good morning,
I would like to reduce the white space at the top of my site content (for example above “Tim Magee” so that it lines up at the top with the right hand sidebar).

https://timmagee.net/

This is where it is:
<div id=”site-content” class=”site-content”>
<div class=”container”>
<main id=”site-main” class=”site-main” role=”main”>

Any ideas on the CSS code to reduce the top margin?

I tried this:
#site-content .site-main {
padding: 0rem 0 0rem;
}
But it didn’t do anything.

Thanks in advance!

Tim Magee