CSS background transparency

I. First, let's talk about the background transparency of CSS.

It is easier to achieve full transparency. Enter

 
{Background:Transparent;}
 

It works in IE, Firefox, and other browsers.

Ii. Let's talk about how CSS achieves translucent background.

It can achieve custom transparency,CodeAs follows:

 { Filter : Alpha ( Opacity =  80 )  ;              /* For IE browser-the transparency is 20% */ -Moz-Opacity :  0.8  ;                      /* For Moz + Firefox-the transparency is 20% */ Opacity :   0.8  ;                          /* The browser that supports css3-the transparency is 20% */  }