如何让我的DIV完全封闭浮动DIV？

.parent {
  overflow: auto;
}

<div class="parent clearfix">
  <!-- 浮动的子元素 -->
</div>

.clearfix::after {
  content: "";
  display: table;
  clear: both;
}

.parent {
  display: flex;
  flex-wrap: wrap;
}

.parent {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}