title: Bootstrap-vue file-form looks like plain text
body: <p>I'm trying to use b-file-form from bootstrap-vue <a href="https://bootstrap-vue.js.org/docs/components/form-file/" rel="nofollow noreferrer">docs</a>.</p>
  
  <p>I've used vue-cli to create bootstrap-vue template project. And I
  've tried to create file-form in my component. But file-form looks like plain text without css. Meanwhile file-form works as it should.
  BootstrapVue has registered in vue app.
  <a href="https://i.stack.imgur.com/9sXE7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9sXE7.png" alt="enter image description here"></a></p>
  
  <p>What can be wrong? And what I can to do to fix that?</p>