Bulma class: .file.is-centered

<div class="field">
  <div class="file is-centered is-boxed is-success has-name">
    <label class="file-label">
      <input class="file-input" type="file" name="resume">
      <span class="file-cta">
        <span class="file-icon">
          <i class="fas fa-upload"></i>
        </span>
        <span class="file-label">
          Centered file…
        </span>
      </span>
      <span class="file-name">
        Screen Shot 2017-07-29 at 15.54.25.png
      </span>
    </label>
  </div>
</div>