If you have a look around line 1464 in your style.css file you’ll see this –
.home-feature-bg-alt .wrap {
margin: 0 auto;
overflow: hidden;
padding: 120px 0 80px;
width: 1140px;
}
You can reduce the top and bottom padding by changing it to this – padding: 60px 0 40px;
That would reduce it by half. You can adjust the numbers to get the look/feel of what you need.