设置“overflow-y元素”的滚动位置

I have this code

我有这段代码

    <div style="width: 400px; height:200px; background-color: #090; overflow-y: scroll">
        <p>first</p>
        <p>aaaaaaaaaa</p>
        <p>aaaaaaaaaa</p>
        <p>aaaaaaaaaa</p>
        <p>aaaaaaaaaa</p>
        <p>aaaaaaaaaa</p>
        <p>aaaaaaaaaa</p>
        <p>aaaaaaaaaa</p>
        <p>aaaaaaaaaa</p>
        <p>last</p>
    </div>
    <div style="wid