Hello.

Would like to thank you for module.

My question is where does inline styles on module added div comes from ?
Specific line when used manual check:

'#prefix' => '<div id="username-check-message" class="username-check-message"></div>',

Generated code on page adds additional style="display: inline-block;" to this div tag.
This line or anywhere in the module files do not add style="display: inline-block;"

I know i can override this in css, but would like to know how it's put there?
How drupal figure out what to put there?