<div class="search">
  <input id="search-input" type="search" placeholder="FASTA uri" required>
  <button class="button search-button" type="submit" onclick="search()">
    <span class="icon ion-search">
      <span class="sr-only">Search</span>
    </span>
  </button>
  <span class="dropt" title="http://collections.lugli.arvadosapi.com/c=00fede2c6f52b053a14edca01cfa02b7+126/sequence.fasta">(example)<span style="width:500px;"></span></span>
</div>