Bootstrap 4 File Upload Form

<div class="container">
  <div class="row mx-0 justify-content-center">
    <div class="col-md-7 col-lg-5 px-lg-2 col-xl-4 px-xl-0">
      <form
        method="POST"
        class="w-100 rounded p-4 border bg-white"
        action="https://herotofu.com/start"
        enctype="multipart/form-data"
      >
        <div class="mb-4">
          <label class="d-block mb-2">Your photo</label>
          <div class="form-control h-auto">
            <input name="photo" type="file" class="form-control-file" />
          </div>
        </div>

        <div class="mb-3">
          <button type="submit" class="btn btn-primary px-3">Upload</button>
        </div>

        <div class="d-block text-right">
          <div class="small">
            by
            <a
              href="https://herotofu.com/start"
              class="text-dark"
              target="_blank"
              >HeroTofu</a
            >
          </div>
        </div>
      </form>
    </div>
  </div>
</div>

/* The following CSS is used only for the preview,
   please don't copy it to your production code */
body { padding: 2rem 0; }