.blog-classic-banner, .blog-fullwidth-banner {
    background:url(../images/header_subpage_bg.jpg) no-repeat;
    background-size: cover;
}
.portfolio-4-col-banner, .portfolio-5-col-banner {
    background:url(../images/header_subpage_bg_2.jpg) no-repeat;
    background-size: cover;
}
.contact-banner {
    background:url(../images/contact_bg.jpg) no-repeat;
    background-size: cover;    
}