How to correctly write a common modifier for BEM blocks?

Question

css

Hello, at the moment I'm trying to apply BEM in projects. There is a simple block layout shown below. Can I add a class to block-1 and block-2, such as fullwidth, which is common to some of the blocks on the site, to add multiple styles to multiple different blocks? Or does bam not allow this and should I use a modifier for both blocks block-1_fullwidth and block-2_fullwidth?:

<div class="block-1">
   <div class="block-1__element"></div>
   <div class="block-1__element"></div>
</div>
<div class="block-2">
   <div class="block-2__element"></div>
   <div class="block-2__element"></div>
</div>

Answer 1

An entity that defines the appearance, state, or behavior of a block or element.

So, yes you can
Words are separated from each other by one underscore.
https://en.bem.info/methodology/quick-start/#Modify...