css透明

background: rgba(53, 181, 235, 0.6)!important; /*for foxfire*/
    /*filter: progid:DXImageTransform.Microsoft.Alpha(opacity=60);*/
filter:alpha(opacity=60); /*for ie*/
.alpha60 { /* Fallback for web browsers that doesn't support RGBa */ background: rgb(0, 0, 0); /* RGBa with 0.6 opacity */ background: rgba(0, 0, 0, 0.6);
 /* For IE 5.5 - 7*/ filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#99000000, endColorstr=#99000000);
 /* For IE 8*/ -ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#99000000, endColorstr=#99000000)"; }