Wordpress sage bootstrap not working

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Wordpress sage bootstrap not working
I have setup a fresh wordpress installation with bedrock and I want to build a theme using the sage workflow.
I've installed everything correctly and I've run a yarn build
successfully.
yarn build
Now when I try something very simple in my body like this:
<div class="container-fluid">
<row>
<div class="col-md-4">col1</div>
<div class="col-md-4">col2</div>
<div class="col-md-4">col3</div>
</row>
</div>
It doesn't actually seem to be working, I just get 3 divs below each other instead of in the bootstrap grid.
When I inspect the element I see the correct css classes and stuff.
During my setup of sage I've selected to load in Bootstrap so I am not sure why it's not working.
Which framework would you like to load? [Bootstrap]:
[0] None
[1] Bootstrap
[2] Bulma
[3] Foundation
[4] Tachyons
> 1
Are you sure you want to overwrite the following files?
- scripts/autoload/_bootstrap.js
- styles/autoload/_bootstrap.scss
- styles/common/_variables.scss
- styles/components/_comments.scss
- styles/components/_forms.scss
- styles/components/_wp-classes.scss
- styles/layouts/_header.scss
(yes/no) [no]:
> yes
Done.
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