CSS自适应宽度圆角按钮 - html/css语言栏目：html.

1.背景图片实现  Html代码:   a { display: block; float:left; margin-left:5px; height: 37px;line-height: 37px;  background: url(btn_bg.png) no-repeat 0px 0px; color: #d84700; text-decoration: none; padding-left:18px; }     a span { display:block; background: url(btn_bg.png) no-repeat right 0px; padding-right:20px;}     a:hover { background: url(btn_bg.png) no-repeat 0px -37px;}     a:hover span{ background: url(btn_bg.png) no-repeat right -37px;}     Html代码:   <p>    <a href="#"><span>免费注册</span></a>    <a href="#"><span>登录</span></a>    <a href="#"><span>自适应宽度</span></a>   </p>   原理就是做一个足够宽的背景，a和span都用同一张背景图，文字左侧部分显示的是a的背景，文字本身和右侧部分显示的是span的背景，拼接成一个按钮。    2.CSS3 火狐和Chrome实现  Html代码:   .button1{   -moz-border-radius:5px;   -webkit-border-radius:5px;   border-radius:5px;      -moz-box-shadow:0 1px 0 rgba(0,0,0,0.3);   -webkit-box-shadow:0 1px 0 rgba(0,0,0,0.3);   box-shadow:0 1px 0 rgba(0,0,0,0.3);      background: -moz-linear-gradient(19% 75% 90deg, #E0E0E0, #FAFAFA);      background: -webkit-gradient(linear, left top, left bottom, from(#FAFAFA), to(#E0E0E0));      color:#4A4A4A;   float:left;   font-family:arial,helvetica,sans-serif;   font-size:17px;   font-weight:bold;   padding:10px 15px;   text-shadow:1px 1px 0 rgba(255, 255, 255, 0.7);   }      .button1:hover{   background: -moz-linear-gradient(19% 75% 90deg,#D6D6D6, #FAFAFA);   background: -webkit-gradient(linear, left top, left bottom, from(#FAFAFA), to(#D6D6D6));   }     Html代码 :  <p><a class="button1">渐变圆角按钮</a></p><br />   效果：  Html代码 : .button7{   -moz-border-radius:3px;   -webkit-border-radius:3px;   border-radius:3px;      background: -moz-linear-gradient(19% 75% 90deg,#F0DEB8, #FDF0D1, #fff 100%);      background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#FFFFFF), to(#F0DEB8), color-stop(.3,#FDF0D1));      color:#836d4d;   float:left;   font-family:arial,helvetica,sans-serif;   font-size:15px;   font-weight:bold;   padding:6px 70px;   border: 1px solid #d4c198;   }      .button7:hover{   background: -moz-linear-gradient(19% 75% 90deg,#EBD9B4, #F2E6C8, #F5F5F5 100%);   background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#F5F5F5), to(#EBD9B4), color-stop(.3,#F2E6C8));   }   <a class="button7"> 站长网</a>