`{{ }}`      ie `{{login_token}}`
`v-`         ie `v-model`
`@something` ie `@click`
`:something` ie `:class="showhide"`

Bulma

<div class="container">
  <div class="columns">
     <div class="column">

Buefy

<b-input
     v-model.trim="captcha"
     id="captcha"
     >
</b-input>