remove border from advanced layer slider

Hi, i tried removing the borders but i dont get it 100%.

The solution in this threat did not work at all: https://kriesi.at/support/topic/remove-layer-slider-borders/
These codes just remove the bottom borader but it is still there ( very hard to see)

#after_layer_slider_1 {
border-top: none!important;
}

.container_wrap { border-top-style: none; }

Is there a clean solution for that?