# Containers in themes: how to predefine css-class for selecting

**URL:** <https://forums.concretecms.org/t/containers-in-themes-how-to-predefine-css-class-for-selecting/3298>\
**Category:** Developing with Concrete\
**Created:** [June 15, 2022, 9:48am UTC](https://forums.concretecms.org/t/containers-in-themes-how-to-predefine-css-class-for-selecting/3298 "2022-06-15T09:48:34Z")\
**Posts on this page:** 1\
**Showing post:** 6

<div class="post-metadata">

**Author:** ![anon83226287](https://forums.concretecms.org/letter_avatar_proxy/v4/letter/a/9de0a6/32.png) [@anon83226287](https://forums.concretecms.org/u/anon83226287)\
**Post date:** [June 16, 2022, 3:41pm UTC](https://forums.concretecms.org/t/containers-in-themes-how-to-predefine-css-class-for-selecting/3298/6 "2022-06-16T15:41:07Z")

</div>

you could use the wildcard \*, works on all blocks & layouts

```auto
public function getThemeBlockClasses()
    {
			return [
            '*' => [
                'your-container-class',
            	],
        ];
    }

```

it somehow works for me.

---

_[View the full topic](https://forums.concretecms.org/t/containers-in-themes-how-to-predefine-css-class-for-selecting/3298)._