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                <div class="balloon">ふきだし</div>


                body {
  padding: 20px;
.balloon {
  position: relative; /* 三角の位置を固定するために設定 */
  width: 300px; /* 幅 */
  margin: 0 auto 40px; /* 上 左右 下のマージン */
  padding: 20px; /* ふきだし内の余白 */
  background: #ddd; /* 背景色 */
  text-align: center; /* テキストの揃え */
  border-radius: 8px; /* <-追加 */
.balloon::before { /* 三角の部分 */
  content: '';
  position: absolute; /* 位置固定 */
  bottom: -28px; /* 線幅の2倍 */
  left: 50%;
  margin-left: -14px; /* 線幅だけずらす */
  border: 14px solid transparent; /* 線幅の設定 */
  border-top-color: #ddd; /* 吹き出しの地と同じ色 */