<div style='width:25%;left:50%;transform:translateX(-50%);position:absolute;'>

  <select class="mdb-select md-form">

    <option value="" disabled selected>Choose your option</option>

    <option value="1">Option 1</option>

    <option value="2">Option 2</option>

    <option value="3">Option 3</option>

  </select>

</div>