diff --git a/src/utils/utils.ts b/src/utils/utils.ts
index ce5622c..4ebd7ee 100644
--- a/src/utils/utils.ts
+++ b/src/utils/utils.ts
@@ -161,12 +161,17 @@ function tempColor(badness: number): [number, number, number] {
     let saturation = 1.0;
     let lightness = 0.75;
     try {
-        saturation = parseFloat(
+        const rSaturation = parseFloat(
             SDFGRenderer.getCssProperty('--overlay-color-saturation')
         );
-        lightness = parseFloat(
+        if (rSaturation !== undefined && !Number.isNaN(rSaturation))
+            saturation = rSaturation;
+
+        const rLightness = parseFloat(
             SDFGRenderer.getCssProperty('--overlay-color-lightness')
         );
+        if (rLightness !== undefined && !Number.isNaN(rLightness))
+            lightness = rLightness;
     } catch (_ignored) {
         // Ignored.
     }
diff --git a/tests/unit/utils/collections.test.ts b/tests/unit/utils/collections.test.ts
index 7f11091..2046321 100644
--- a/tests/unit/utils/collections.test.ts
+++ b/tests/unit/utils/collections.test.ts
@@ -1,6 +1,6 @@
 // Copyright 2019-2024 ETH Zurich and the DaCe authors. All rights reserved.
 
-import { AccessStack, LinkedStack } from "../../../src/utils/collections";
+import { AccessStack, LinkedStack } from '../../../src/utils/collections';
 
 function testLinkedStackConstruction(): void {
     const lStack = new LinkedStack();
diff --git a/tests/unit/utils/utils.test.ts b/tests/unit/utils/utils.test.ts
new file mode 100644
index 0000000..22c5aee
--- /dev/null
+++ b/tests/unit/utils/utils.test.ts
@@ -0,0 +1,13 @@
+// Copyright 2019-2024 ETH Zurich and the DaCe authors. All rights reserved.
+
+import { getTempColorHslString } from '../../../src';
+
+function testTempColor(): void {
+    expect(getTempColorHslString(1.0)).toBe('hsl(0,100%,75%)');
+    expect(getTempColorHslString(0.0)).toBe('hsl(120,100%,75%)');
+    expect(getTempColorHslString(0.5)).toBe('hsl(60,100%,75%)');
+}
+
+describe('Test utility functions', () => {
+    test('Badness to temperature color conversion', testTempColor);
+});