section.main-section {
  background-image: url(../images/bg/bg_home.jpg);
}

section.nav-section {
  background-image: url(../images/bg_header.jpg);
}

section.about-section .about-background {
  background-image: url(../images/bg_about.jpg);
}

section.services-main-section {
  background-image: url(../images/bg/bg_header.jpg);
}

section.about-main-section {
  background-image: url(../images/bg/bg_header.jpg);
}

section.contact-main-section {
  background-image: url(../images/bg/bg_header.jpg);
}