Flexbox:水平和垂直居中如何使用flexbox在容器内水平和垂直居中div。在下面的例子中,我希望每个数字彼此相同(在行中),它们是水平居中的。.flex-container { padding: 0; margin: 0; list-style: none; display: flex; align-items: center; justify-content: center;}row { width: 100%;}.flex-item { background: tomato; padding: 5px; width: 200px; height: 150px; margin: 10px; line-height: 150px; color: white; font-weight: bold; font-size: 3em; text-align: center;}<div class="flex-container"> <div class="row"> <span class="flex-item">1</span> </div> <div class="row"> <span class="flex-item">2</span> </div> <div class="row"> <span class="flex-item">3</span> </div> <div class="row"> <span class="flex-item">4</span> </div></div>http://codepen.io/anon/pen/zLxBo
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