http://stackoverflow.com/questions/42289260/javafx-how-can-i-put-slider-tick-labels-above-its-sliding-track-in-horizontal-s

slider.css

.slider > .axis {
	/* Moves the Labels up: */
	-fx-translate-y: -25.0;
	/* Aligns Labels to top in their parent: */
	-fx-side: top;
}

SliderTicksAbove.java

package com.isp.stackoverflow;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Slider;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javafx.util.StringConverter;

/**
 * Shows a {@link Slider} with tick Labels above the track.
 * 
 * @author okr
 * @date 17.02.2017
 *
 */
public class SliderTicksAbove extends Application {

	@Override
	public void start(final Stage primaryStage) {
    final StackPane root = new StackPane();
    root.setPadding( new Insets( 16 ) );
    final Slider slider = new Slider();
    slider.setShowTickLabels( true );
    final double sliderMax = slider.getMax();
    slider.setLabelFormatter( new StringConverter<Double>()
    {
      @Override
      public String toString( final Double d )
      {
        return String.valueOf( (int) (sliderMax - d) );
      }

      @Override
      public Double fromString( final String str )
      {
        return sliderMax - Double.parseDouble( str );
      }
    } );
    root.getChildren().add( slider );
    final Scene scene = new Scene( root );
    scene.getStylesheets().add( getClass().getResource( "slider.css" ).toExternalForm() );
    primaryStage.setWidth( 400 );
    primaryStage.setHeight( 200 );
    primaryStage.setScene( scene );
    primaryStage.show();
	}

  /**
   * @param args ignored.
   */
	public static void main(final String[] args) {
		launch(args);
	}
}