css background:url("../images/new_active.png") no-repeat scroll 0 0 transparent;scroll 0 0 transparent

css background:url(../images/new_active.png) no-repeat scroll 0 0 transparent;scroll 0 0 transparent CSS求解释.background:url(1.jpg) no-repeat 0 50%; 0 和 50%代表的含义. CSS代码求解释：background:url(nav-bar.gif) no-repeat right center;帮忙说明下background:url(nav-bar.gif) no-repeat right center;中的right和center是何作用 CSS中 .nav{background:url(img/bgli_left.gif) repeat-x scroll left bottom;}重点解释scroll重点解释scroll.X轴左下角平铺 a:hover span{ background:url(btn_bg.gif) no-repeat right -37px;}这段CSS代码中,属性right的含义? css中background和_background属性的区别css样式表中有如下语句：.imminbox { width:39px; height:29px;padding-right:3px; cursor:pointer; position:absolute ;right:1px; bottom:0px;z-index:20; overflow:visible; background:url(../images/im_mi @import url("widget.css"); CSS background-position 定义背景具体位置如何计算? 初学css,求教css的大神,url(../images/feature_right.gif) repeat scroll center toprepeat scroll center background:transparent url(images/yqlj_r4_c1.gif)repeat scroll 0 0 background:url(tupian/main_bg.gif) top repeat-x;是什么意思? CSS里body里字体颜色设置color:rgb(102,102,102)；这里面后面为什么会带一个括号,完整的bodybody { margin:0pt; padding:0pt; background:rgb(136,164,183) url('images/body_bg.gif') repeat-x scroll center top; font-family:Tahoma,Arial 请高人解释下这些css代码小弟刚学有些东西不理解#zishu li{ float:left; margin-left:5px; margin-top:50px;}.nav_a a:link,.nav_a a:visited{text-decoration:none; display:block; padding-right:10px; background:url(http://www.zishu.cn/atta div+css高手进,a { display:block; height:34px; width:107px; line-height:2; text-align:center; background:url(images/2010-08/14/014304_btn_bg.gif) no-repeat 0px 0px; color:#ff0000; padding-top:3px; }重点是那个line-height:2 ,no-repeat 0px 0px pa 关于css a:active标签失效的问题#pic_left li{ list-style-type:none; font-size:30px; margin-top:18px; background:url(../images/pic_1.gif); width:140px;}#pic_left li a{width:140px;display:inline-block; color:#000; text-decoration:none;}#pic_left URL CSS中class和id的区别例如：CSSBBS新手教程第一课div{ width:100px; height:100px; border:1px solid #000; float:left; background:#99FF00; margin-left:10px;}.css{ background:#FFFF00}#css{ background:#00FFFF}直接div.css#css我修改运行 background:url(images/share.png) no-repeat -999px -999px;中-999px