Simple Icons not working for me - help needed

[lennon101]

I'm not really sure why, but I'm almost sure it's a configuration issue or my misunderstanding of how to use it. But I've installed SimpleIcons using HACS and upgraded to the latest version and yet I'm not able use any of the icons. See example below where I'm trying to use the si:zigbee2mqtt icon for a button card.

In fact, typing si: does not show any icons at all... should it?

HACS installed SimpleIcons:

System information:

version	core-2024.10.3
installation_type	Home Assistant Container
dev	false
hassio	false
docker	true
user	root
virtualenv	false
python_version	3.12.4
os_name	Linux
os_version	6.8.0-47-generic
arch	x86_64
timezone	Australia/Brisbane
config_dir	/config

[lennon101]

I've already restarted HA several times and refreshed broswer cache