diff --git a/swing/src/net/sf/openrocket/gui/components/BasicSlider.java b/swing/src/net/sf/openrocket/gui/components/BasicSlider.java
index 026641768..af43fe687 100644
--- a/swing/src/net/sf/openrocket/gui/components/BasicSlider.java
+++ b/swing/src/net/sf/openrocket/gui/components/BasicSlider.java
@@ -1,5 +1,8 @@
 package net.sf.openrocket.gui.components;
 
+import net.sf.openrocket.gui.util.GUIUtil;
+import net.sf.openrocket.gui.util.UITheme;
+
 import javax.swing.BoundedRangeModel;
 import javax.swing.JSlider;
 import javax.swing.plaf.basic.BasicSliderUI;
@@ -27,7 +30,11 @@ public class BasicSlider extends JSlider {
 		setOrientation(orientation);
 		setInverted(inverted);
 		setFocusable(false);
-		setUI(new BasicSliderUI(this));
+		if (UITheme.isLightTheme(GUIUtil.getUITheme())) {
+			setUI(new BasicSliderUI(this));
+		} else {
+			setUI(new DarkBasicSliderUI(this));
+		}
 	}
 
 }
diff --git a/swing/src/net/sf/openrocket/gui/components/DarkBasicSliderUI.java b/swing/src/net/sf/openrocket/gui/components/DarkBasicSliderUI.java
new file mode 100644
index 000000000..b22ee1885
--- /dev/null
+++ b/swing/src/net/sf/openrocket/gui/components/DarkBasicSliderUI.java
@@ -0,0 +1,51 @@
+package net.sf.openrocket.gui.components;
+
+import javax.swing.JSlider;
+import javax.swing.plaf.basic.BasicSliderUI;
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Rectangle;
+
+/**
+ * BasicSliderUI for dark theme UI.
+ */
+public class DarkBasicSliderUI extends BasicSliderUI {
+	private static final Color trackColor = new Color(159, 159, 159);
+	private static final Color thumbColor = new Color(82, 82, 82);
+	private static final Color thumbBorderColor = new Color(166, 166, 166);
+
+	public DarkBasicSliderUI(JSlider b) {
+		super(b);
+	}
+
+	@Override
+	public void paintTrack(Graphics g) {
+		g.setColor(trackColor);
+		super.paintTrack(g);
+	}
+
+	@Override
+	public void paintThumb(Graphics g) {
+		Graphics2D g2d = (Graphics2D) g;
+		Rectangle thumbBounds = thumbRect;
+		int w = thumbBounds.width;
+		int h = thumbBounds.height;
+
+		int borderInset = 2;  // Adjust this value to change the border thickness
+
+		// Draw the border
+		g2d.setColor(thumbBorderColor);
+		g2d.fillRect(thumbBounds.x, thumbBounds.y, w, h);
+
+		// Draw the thumb fill
+		g2d.setColor(thumbColor);
+		g2d.fillRect(
+				thumbBounds.x + borderInset - 1,
+				thumbBounds.y + borderInset - 1,
+				w - 2 * borderInset + 1,
+				h - 2 * borderInset + 1
+		);
+	}
+
+}
\ No newline at end of file