czml label white fillColor appears greyish

1. A concise explanation of the problem you're experiencing.

- load czml label with white "fillColor"

- rendered text appears greyish (208,208,208) instead of (255,255,255) value

2. A minimal code example. If you've found a bug, this helps us reproduce and repair it.

3. Context. Why do you need to do this? We might know a better way to accomplish your goal.

i need white text labels

4. The Cesium version you're using, your operating system and browser.

1.58 , see sandcastle link

This can be avoided by disabling high dynamic range (HDR) support.

viewer.scene.highDynamicRange = false;