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div样式布局问题

有这样个布局,上面的div固定高度,下面的div高度不固定,但是要充满下面的空间。
而不知道外层红色div高度,是根据窗口的高度改变而改变。
要下面那个蓝色的div自适应高度,当下面div中的内容溢出时显示滚动条。

这个需求该怎么实现,要求css

clipboard.png


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.red-div {
    position:relative;
}
.blud-div-bottom {
    position:absolute;
    top: 上面div的高度;
    bottom: 0;
    width: 100%;
    overflow-y: auto;
}

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