I've uploaded the stylesheet so you can apply it to the VicEmergency website using Developer Tools in your web browser.
It desaturates the basemap, makes fire boundaries opaque and more visible with thicker stroke, hides advice zones and blurs watch & act and emergency zones so it's not as cluttered.
https://www.purecaffeine.com/files/vicfires-map-custom-styles.css
For style purposes only. Use at your own risk.