如何在页面中间对齐3个div？

<div class="container">
  <div class="div1"></div>
  <div class="div2"></div>
  <div class="div3"></div>
</div>

.container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh; /* 设置容器高度为视口高度 */
}

.div1, .div2, .div3 {
  width: 100px;
  height: 100px;
  background-color: #ccc;
  margin: 10px;
}

<div class="container">
  <div class="div1"></div>
  <div class="div2"></div>
  <div class="div3"></div>
</div>

.container {
  position: relative;
  height: 100vh; /* 设置容器高度为视口高度 */
}

.div1, .div2, .div3 {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 100px;
  height: 100px;
  background-color: #ccc;
  margin: 10px;
}

<div class="container">
  <div class="div1"></div>
  <div class="div2"></div>
  <div class="div3"></div>
</div>

.container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  justify-items: center;
  align-items: center;
  height: 100vh; /* 设置容器高度为视口高度 */
}

.div1, .div2, .div3 {
  width: 100px;
  height: 100px;
  background-color: #ccc;
  margin: 10px;
}