<main>
  <div class="wrapper">
      <form method="post" enctype="multipart/form-data">
 <div>
   <label for="file">Choose file to upload</label>
   <input type="file" id="file" name="file" multiple>
 </div>
 <div>
   <button>Upload image</button>
 </div>
</form>
  </div>
</main>

button {
  margin-top: 1rem;
}