There is a padding on the container which is found around line 473 in the style.css
padding: 4em 0;
You can change that, but don’t change the theme’s file(s) when making modifications, use the child theme for that. IF you only plan to make changes to CSS, then a CSS editing plugin will work, or if you use JetPack, it has a CSS editor built in. The code above you would change the 4em to something smaller.