Bootstrap not working in v13

Trying to make a print format for Purchase Invoice in Erpnext V13 using bootstrap css

Something like this :
https://getbootstrap.com/docs/4.6/layout/grid/

<div class="container">
  <div class="row">
    <div class="col-sm">
      One of three columns
    </div>
    <div class="col-sm">
      One of three columns
    </div>
    <div class="col-sm">
      One of three columns
    </div>
  </div>
</div>

But getting this as output :

@Aakif try using “col-sm-4” instead of “col-sm” . or “col-xs-4”

Thankyou!

col-md-4 and col-sm-4 dosent work

col-xs-4 works