As you can see in the screenshot below most DOM Element get assigned a class starting by kcSomething. Example kcFormHeaderClass.
No styles rules get assigned to those classes they are only here for you to use as target for your custom CSS.
Inspecting the login.ftl page in chrome dev tools
So if you're not very interested in all the bells and whistles Keycloakify offers, you can just create a CSS1 file and just start customizing the page:
Applying a red border to all the DOM element with the kcFormHeaderClass class
The red border gets applied
Up next:
{% content-ref url="removing-the-default-styles.md" %} removing-the-default-styles.md {% endcontent-ref %}
Footnotes
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...or LESS or SASS ↩