.photo {
  .controls:first-child {
    .control_icon {
      @include transition(opacity);
      opacity: 0;
    }
  }

  &:hover {
    .controls:first-child {
      .control_icon {
        opacity: 0.3;
      }
      .control_icon:hover {
        opacity: 1;
      }
    }
  }
}