javascript - flexbox list列反转并从顶部开始

我想显示带有Firebase的最新聊天人员1st position(active)，但是Firebase没有日期字段。所以我用flexbox column-reverse调整日期的毫秒数，它将从顶部开始而不是从底部开始。我已经尝试过使用位置，但是没有工作。
您能给我一个很好的方法吗？

.container {
    display: flex;
    flex-direction: column-reverse;
    /*flex-flow: flex-start;*/
    justify-content: flex-end;
    align-items: flex-start;
    height: 700px;
    width: 100%;
    background: blue;
    position: absolute;
    overflow:auto;
}
.box {
position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 20px;
    width: 50px;
    height: 50px;
    background-color: red;
    top:0px;
}
.active{
    order:1;
}

<ul class="container">
    <li class="box">1</li>
    <li class="box">2</li>
    <li class="box active">3</li>
    <li class="box">4</li>
    <li class="box">5</li>
    <li class="box">6</li>
</ul>

最佳答案

将justify-content属性更改为flex-end-参见下面的演示：

.container {
    display: flex;
    flex-direction: column-reverse;
    /*flex-flow: flex-start;*/
    justify-content: flex-end; /* CHANGED */
    align-items: flex-start;
    height: 700px;
    width: 100%;
    background: blue;
    position: absolute;
    overflow:auto;
}
.box {
position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 20px;
    width: 50px;
    height: 50px;
    background-color: red;
    top:0px;
}

<ul class="container">
    <li class="box">1</li>
    <li class="box">2</li>
    <li class="box">3</li>
    <li class="box">4</li>
    <li class="box">5</li>
    <li class="box">6</li>
</ul>