#landing {

  .row {  }

  section#splash {

    @include background("../images/background/revuc-background.jpg");

  }

  section#schedule {
    @include background("../images/background/circuit-bg.jpg");
  }

  section#sponsors {
    @include background("../images/background/circuit-bg.jpg");
  }

  section#about {
    @include background("../images/background/circuit-bg.png");
  }

  section#about-1 {
    @include background("../images/photos/collab-bg.jpg");
  }

  section#about-2 {
    @include background("../images/background/circuit-bg.jpg");
  }

  section#about-3 {
    @include background("../images/photos/Hack.jpg");
  }

  section#submissions {
    @include background("../images/photos/expo-bg.jpg");
    //@include background("../images/background/circuit-bg.png");
  }

  section#registration {
    @include background("../images/photos/expo-bg.jpg");
  }

}

#landing {

  .row {  }

  section#splash {

    @include background("../images/background/revuc-background.jpg");

  }

  section#schedule {
    @include background("../images/background/circuit-bg.jpg");
  }

  section#sponsors {
    @include background("../images/background/circuit-bg.jpg");
  }

  section#about {
    @include background("../images/background/circuit-bg.jpg");
  }

  section#about-1 {
    @include background("../images/photos/collab-bg.jpg");
  }

  section#about-2 {
    @include background("../images/background/circuit-bg.jpg");
  }

  section#about-3 {
    @include background("../images/photos/Hack.jpg");
  }

  section#submissions {
    @include background("../images/photos/expo-bg.jpg");
    //@include background("../images/background/circuit-bg.png");
  }

  section#registration {
    @include background("../images/photos/expo-bg.jpg");
  }

}

Fix about section bg image url
Fix about section bg image url
