Hi,

Yes, in Odoo, just like in any other web development framework, you can add classes or IDs to elements (blocks) to identify and apply CSS properties to them. Odoo follows standard web development practices, so you can manipulate HTML templates and CSS files to achieve this.

Example :

<template id="custom_template" name="Custom Template">

    <div class="custom-class" id="unique-id">

        <!-- Your content here -->

    </div>

</template>

Hope it helps