Hey there,
i am trying to upgrade my home assistant setup and i would like to create a colorful dashboard like the demo one.
During this i noticed that my icons are just grey. What did i do wrong?
Did i miss some theme configuration?
Thanks for helping out 
Some cards allow icons and colors to be user selected in the card configuration. Some cards have a SHOW STATE COLOR toggle in the card configuration that will color an entity icon when it is ON.
oh thanks! i did miss that after i added the entity to the header i need to edit it again