The background of the DIV is not transparent:
This problem is relatively simple, but may be unfamiliar to beginners, for example, some beginners may think that the background color of the div is white, because sometimes it looks like this. Here's an example to show if this is the case. The code is as follows:
<!DOCTYPE HTML><HTML><Head><MetaCharSet= "Utf-8"><Metaname= "Author"content= "http://www.51texiao.cn/" /><title>Ant Tribe</title><styletype= "Text/css">Div{width:100px;Height:100px;position:Absolute;}. Left{ Left:20px;Top:20px;Background-color:#699;Z-index:1;}. Right{ Left:40px;Top:40px;Border:1px solid Red;Z-index:Ten;}</style></Head><Body><Divclass= "Left"></Div><Divclass= "Right"></Div></Body></HTML>
From the above code performance can be seen that the background of the DIV is transparent.
The original address is: http://www.51texiao.cn/div_cssjiaocheng/2015/0508/937.html
The most original address is: http://www.softwhy.com/forum.php?mod=viewthread&tid=4682
The background of the DIV is not transparent
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