IE11需要父母拥有
flex-direction: column。
此示例旋转了按钮：
#div { height: 200px; width: 50px; border: 1px solid black; display: flex; align-items: center; justify-content: center; flex-direction: column}#button { height: 50px; width: 200px; min-width: 200px; border: 1px solid black; background-color: red; transform: rotate(90deg);}<div id="div"> <button id="button">HELLO</button></div>
