html - How to resolve this overlap div issue and understanding the concept?

Question

I have show in attached diagram detail with problem i hope this will make clear sense and i got reply from professionals soon.

picture shown here due to some post restriction i am unable to upload or embed picture so you just need copy following url to understand problem.

image link here

Thank You

Answer 1

尝试在页脚 div 之前添加此代码。

<div style="clear:both;"></div>

Answer 2

我不知道你的完整代码。在我看来，删除这两行并检查。

footer{
position: absolute;
bottom: 0;
}

页脚必须在 div3 之后。