Make an image full bleed into header section

Site URL: http://hieuszphoto.squarespace.com/

Hi, 

I am trying to make an image full bleed into the header section. I attached a screen of how the site currently looks. I am trying to make the image on only the overview page expand into the header section but I'm having trouble doing so. Does anyone have advice? 

Thanks so much!

Add to Home > Design > Custom CSS

.homepage section:first-child {
    padding-top: 0 !important;
}