如何在广告中居中对齐一组浮动按钮？

<div class="button-container">
  <button class="floating-button">按钮1</button>
  <button class="floating-button">按钮2</button>
  <button class="floating-button">按钮3</button>
</div>

.button-container {
  width: 100%;
  text-align: center;
}

.floating-button {
  background-color: #f1f1f1;
  border: none;
  color: #000;
  padding: 10px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
  float: left;
}

.button-container {
  display: flex;
  justify-content: center;
}

.button-container {
  margin-left: auto;
  margin-right: auto;
}