How to make a button not clipped?

Question

Bootstrap

How to make a whole button: otherwise the right half is not rounded:

<div class="btn-group" role="group">
    <button id="btnGroupDrop1" type="button" class="btn btn-outline-success btn-sm button-place-ads" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
      Разместить
    </button>
    <div class="dropdown-menu" aria-labelledby="btnGroupDrop1">
    <a class="dropdown-item" href="<?php echo _link("add_publication"); ?>">Статью</a>
     	<a class="dropdown-item" href="<?php echo _link("add_ad"); ?>">Объявление</a>
        <a class="dropdown-item" href="<?php echo _link("open-shop"); ?>">Открыть магазин</a>
    </div>
  </div>