defautl class on block

To achieve this, you need to add the style separated from the block and set the classes to the block. Look for example how this is done in the basic blocks plugin: https://github.com/artf/grapesjs-blocks-basic/blob/master/src/index.js#L29

You can also do this

content: `
	<div class="header-banner">...</div>
	<style>
		.header-banner {
			...
		}
	</style>
`

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