html - 根据窗口滚动条移动div

Question

如果我的窗口向下滚动并在窗口向上滚动时向上移动，我想将我的 div 向下移动吗？如何实现？

Answer 1

<div style="position:fixed;">
  <p>Hello World</p>
</div>

position:fixed

Generates an absolutely positioned element, positioned relative to the browser window. The element's position is specified with the "left", "top", "right", and "bottom" properties.

Source: http://www.w3schools.com/Css/pr_class_position.asp