flex-direction: column;

flex-direction: column; 是一种CSS属性，用于设置flex布局中主轴的方向为垂直方向。 这意味着子元素将按照列的方式排列，而不是默认的行排列方式。 当设置了flex-direction: column; 后，如果还想要垂直居中对齐子元素，可以使用align-items: center; 属性。 这样子元素就会在主轴方向上垂直居中对齐。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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