如何使用css将文本放在"框"的右上角或右下角

<div class="box">
  <span class="text-top-right">右上角</span>
  <span class="text-bottom-right">右下角</span>
</div>

.box {
  position: relative;
  width: 200px;
  height: 200px;
  border: 1px solid black;
}

.text-top-right {
  position: absolute;
  top: 0;
  right: 0;
}

.text-bottom-right {
  position: absolute;
  bottom: 0;
  right: 0;
}

<div class="box">
  <span class="text-top-right">右上角</span>
  <span class="text-bottom-right">右下角</span>
</div>

.box {
  display: flex;
  justify-content: flex-end;
  align-items: flex-start;
  width: 200px;
  height: 200px;
  border: 1px solid black;
}

.text-top-right {
  margin-right: 0;
  margin-top: 0;
}

.text-bottom-right {
  margin-right: 0;
  margin-bottom: 0;
}