container-block.js

const { __ } = wp.i18n;
const { InnerBlocks } = wp.editor;
const { registerBlockType } = wp.blocks;

registerBlockType(
    'kit/container',
    {
        title: __('Container'),
        description: __('Add a container for blocks'),
        category: 'common',
        supports: { html: false },

        edit(props) {

            const { className } = props;
            return (
                <div className={className}>
                    <InnerBlocks />
                </div>
            );
        },
        save(props) {

            const { className } = props;
            return (
                <section className={className}>
                    <InnerBlocks.Content/>
                </section>
            );
        }

    }
)