Table Small doesn't work

[crescent1]

hi, looks like table-sm doesn't work.

<div class="table-responsive">
 <table class="table table-sm table-hover">
  <thead>
     <tr class="bg-primary text-center">
          <th class="text-white">No</th>
          <th class="text-white">Name</th>
          <th class="text-white">Email</th>
          <th class="text-white">Type</th>
          <th class="text-white"></th>
      </tr>
   </thead>
 </table>
</div>

pic: