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

  &:hover {
    .controls:first-child {
      .control_icon {
        @include opacity(0.3);
      }
      .control_icon:hover {
        @include opacity(1);
      }
    }
  }
}