[html] Using margin:auto to vertically-align a div

_x000D_
_x000D_
.black {_x000D_
    display:flex;_x000D_
    flex-direction: column;_x000D_
    height: 200px;_x000D_
    background:grey_x000D_
}_x000D_
.message {_x000D_
    background:yellow;_x000D_
    width:200px;_x000D_
    padding:10px;_x000D_
    margin: auto auto;_x000D_
}
_x000D_
<div class="black">_x000D_
    <div class="message">_x000D_
        This is a popup message._x000D_
    </div>_x000D_
</div>
_x000D_
_x000D_
_x000D_

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