ยังไงให้เด็ก div อยู่ถูกข้างบนเหรอ

.content {
  align-items: center;
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  height: 200px;
  min-height: 140px;
  min-width: 140px;
  border: 1px solid;
  position: relative; //Add this line
}

.topcorner {
  width: 42px;
  height: 42px;
  background: red;
  position: absolute;
  top: 0;
  right: 0;
  z-index: 1;
}

<div class="content">
  <div class="topcorner">top</div>
</div>