如何填充<a>标记以填充容器内的父div

<div class="parent">
  <a href="#" class="child">Link</a>
</div>

.parent {
  display: flex;
  justify-content: center; /* 水平居中 */
  align-items: center; /* 垂直居中 */
  width: 300px;
  height: 200px;
  border: 1px solid #000;
}

.child {
  flex: 1;
}

<div class="parent">
  <a href="#" class="child">Link</a>
</div>

.parent {
  display: grid;
  place-items: center; /* 水平垂直居中 */
  width: 300px;
  height: 200px;
  border: 1px solid #000;
}

.child {
  grid-area: 1 / 1 / 2 / 2; /* 占据整个网格区域 */
}