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我有一个大约 5000 像素高度的页面，相当长的页面。单击按钮时，会出现一个覆盖，该覆盖从页面顶部开始，高度约为 2000 像素。我想拥有它，这样当覆盖在屏幕上时，用户不能滚动超过 2000 像素。
我环顾四周，大多数建议都指向了特定的滚动情况，现在正是我想要的。有什么建议么？