Html+Css知识总汇

.bg{
background:url(../img/背景.jpg) ;
/* 背景自适应 */
background-attachment: fixed;
background-repeat:no-repeat ;
background-size:100% 100%;
/* 背景透明度 */
/* background:transparent ; */
filter:alpha(opacity=80);
-moz-opacity:0.5;
-khtml-opacity: 0.5;
opacity: 0.7;
}


博客



iframe{
width: 100%;
height: 870px;
}