diff --git a/chartfx-chart/src/test/java/io/fair_acc/chartfx/renderer/spi/LabelledMarkerRendererTests.java b/chartfx-chart/src/test/java/io/fair_acc/chartfx/renderer/spi/LabelledMarkerRendererTests.java
index ab7e8ff23..7bc76d773 100644
--- a/chartfx-chart/src/test/java/io/fair_acc/chartfx/renderer/spi/LabelledMarkerRendererTests.java
+++ b/chartfx-chart/src/test/java/io/fair_acc/chartfx/renderer/spi/LabelledMarkerRendererTests.java
@@ -147,8 +147,8 @@ private DataSet getTestDataSet() {
 
             if (n == 6) {
                 dataSet.addDataStyle(n, style.reset()
-                                                .setLineColor("0xEE00EE")
-                                                .setMarkerColor("0xEE00EE")
+                                                .setLineColor("#EE00EE")
+                                                .setMarkerColor("#EE00EE")
                                                 .setStrokeDashPattern(5, 8, 5, 16)
                                                 .build());
             }
diff --git a/chartfx-chart/src/test/java/io/fair_acc/chartfx/ui/css/DataSetStyleParserTest.java b/chartfx-chart/src/test/java/io/fair_acc/chartfx/ui/css/DataSetStyleParserTest.java
index 09514a589..dd4c87c3d 100644
--- a/chartfx-chart/src/test/java/io/fair_acc/chartfx/ui/css/DataSetStyleParserTest.java
+++ b/chartfx-chart/src/test/java/io/fair_acc/chartfx/ui/css/DataSetStyleParserTest.java
@@ -36,7 +36,7 @@ void testStyleParserAuto() {
         assertEquals(Color.BLUE, parser.getFillColor().orElseThrow());
 
         style = builder.reset().setFill(255, 255, 0, 1).build();
-        assertEquals("-fx-fill: 0xffff00ff;", style);
+        assertEquals("-fx-fill: #ffff00ff;", style);
         assertTrue(parser.tryParse(style));
         assertEquals(Color.YELLOW, parser.getFillColor().orElseThrow());
 
@@ -69,8 +69,8 @@ void testStyleParserAuto() {
                         .setLineWidth(3)
                         .setFont("monospace")
                         .setFontItalic(true)
-                        .setStroke("0xEE00EE")
-                        .setFill("0xEE00EE")
+                        .setStroke("#EE00EE")
+                        .setFill("#EE00EE")
                         .setLineDashes(5, 8, 5, 16)
                         .setFill("blue")
                         .setLineDashes(3, 5, 8, 5)
@@ -83,7 +83,7 @@ void testStyleParserAuto() {
                              + "-fx-line-width: 3.0;\n"
                              + "-fx-font: monospace;\n"
                              + "-fx-font-weight: bold;\n"
-                             + "-fx-stroke: 0xEE00EE;",
+                             + "-fx-stroke: #EE00EE;",
                 style);
         assertTrue(parser.tryParse(style));
         assertArrayEquals(new double[] { 3, 5, 8, 5 }, parser.getLineDashes().orElseThrow());
diff --git a/chartfx-dataset/src/main/java/io/fair_acc/dataset/utils/StyleBuilder.java b/chartfx-dataset/src/main/java/io/fair_acc/dataset/utils/StyleBuilder.java
index 34d6a584e..ea3848fe8 100644
--- a/chartfx-dataset/src/main/java/io/fair_acc/dataset/utils/StyleBuilder.java
+++ b/chartfx-dataset/src/main/java/io/fair_acc/dataset/utils/StyleBuilder.java
@@ -64,7 +64,7 @@ protected T setColorProp(String key, double r, double g, double b, double a) {
 
     protected T setColorProp(String key, int r, int g, int b, double a) {
         int o = (int) Math.round(a * 255.0);
-        properties.put(key, String.format("0x%02x%02x%02x%02x", r & 0xFF, g & 0xFF, b & 0xFF, o & 0xFF));
+        properties.put(key, String.format("#%02x%02x%02x%02x", r & 0xFF, g & 0xFF, b & 0xFF, o & 0xFF));
         return getThis();
     }
 
diff --git a/chartfx-samples/src/main/java/io/fair_acc/sample/chart/LabelledMarkerSample.java b/chartfx-samples/src/main/java/io/fair_acc/sample/chart/LabelledMarkerSample.java
index 1e5524c8f..e9fb00b50 100644
--- a/chartfx-samples/src/main/java/io/fair_acc/sample/chart/LabelledMarkerSample.java
+++ b/chartfx-samples/src/main/java/io/fair_acc/sample/chart/LabelledMarkerSample.java
@@ -56,8 +56,8 @@ public Node getChartPanel(final Stage primaryStage) {
 
             if (n == 6) {
                 dataSet.addDataStyle(n, style.reset()
-                                                .setStroke("0xEE00EE")
-                                                .setFill("0xEE00EE")
+                                                .setStroke("#EE00EE")
+                                                .setFill("#EE00EE")
                                                 .setStrokeDashPattern(5, 8, 5, 16)
                                                 .build());
             }