You can reduce it by looking for this code (on line 1465 in your style.css) –
.home-feature-bg-alt .wrap {
margin: 0 auto;
overflow: hidden;
padding: 120px 0 80px;
width: 1140px;
}
Reduce 120px
to a lower number, or 0 and that should do it.
Let me know if that helps.