Here’s how to do it with CSS. You could adjust your CSS, or simply add the following code to your CSS and it would override it.
.front-page .site-header {
margin-top: -60px !important;
padding: 0;
}
.site-header {
position: relative !important;
top: 80px !important;
}
.site-header.light {
background: none !important;
}