Custom-ui - How to implement

Hi,

I don’t have a lot of yaml experience.

I’m trying to use the custom-ui module to change the colour of the icons in my cards:

I’ve already installed the module via HACS.

I’ve created the file customize.yaml
image

In configuration.yaml I’ve add an include to customize.yaml
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But I seem to get an error:

What am I missing?

More info on the module:

Thanks for the help!

You syntax is wrong. It should be:

homeassistant:
  customize: !include customize.yaml