Every widget gets padding/margin/border-width reset to 0 inline at creation (needed for a free-positioning canvas, otherwise every <h1>/<ul>/<p> would carry the browser's default spacing) — but for a widget that carries an external class like Bulma's button/box (see fixed_attrs in registry.py), inline style always wins over the class, so this reset silently stripped Bulma's own padding and border, making them look nothing like the real components. Bouton/Conteneur/Titre now skip this reset for those three properties, letting Bulma's own box model show through until a value is actually customized.
Also cleaned the frozen 0px values out of existing elements in the two live project databases (projects/test, projects/test-2) — only removed values that exactly matched the old frozen default, any genuinely customized non-zero padding/margin/border-width was left untouched.
william
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