css实现html图片自适应手机屏幕大小

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代码如下:

body,button,dd,dl,dt,fieldset,form,h2,h3,h4,h5,h6,h7,input,legend,li,ol,p,select,table,td,textarea,th,ul {
margin: 0;
padding: 0
}
body {
min-width: 320px;
font-family: 'microsoft yahei',Verdana,Arial,Helvetica,sans-serif;
color: #333;
-webkit-text-size-adjust: none
}
fieldset,img {
border: 0
}
ol,ul {
list-style: none
}
address,em {
font-style: normal
}
a {
color: #000;
text-decoration: none
}
table {
border-collapse: collapse
}
#clear {
clear: both;
width: 100%;
background-color: #fff
}
#clear: after {
display: block;
clear: both;
height: 1px;
content: ''
}
img, fieldset {
border: 0;
}
img {
height: auto;
width: auto\9;
width:100%;
}
.content-step ul li .red{ color:#e5362b; background:none; width:inherit; vertical-align:inherit}
* {
-webkit-tap-highlight-color: rgba(0,0,0,0);
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
-ms-box-sizing: border-box;
box-sizing: border-box
}
.doc {
padding:10px;
margin: 0 auto;
}
.doc h2 {font-size:16px;color:#333;padding:10px 0;font-weight:500;}
.shop-title {padding:10px 0;}
.author {padding:10px 0;font-size:12px;}
.author span {color:#333;}
.author a {color:#2B8CB2;}
.content {padding:20px 0;}
.f-bold {background-color:#CCC5C0;color:#E5362B;padding:5px;line-height:24px;font-size:14px;}
.content p {line-height:24px;padding:10px 0;text-indent:2em; font-size:14px;}
.content-time {padding:20px 0;color:#000;font-weight:500;line-height:40px;}
.content-time span {color:#000;}
.content-time em {color:#E5362B;}
.content-step {}
.content-step ul {padding:20px 0;}
.content-step ul li {line-height:30px;color:#5D5D5D; font-size:14px; padding-top:0}
.content-step ul li .icon{ display:inline-block; background:url(../images/icon.jpg) no-repeat scroll; width:20px; height:20px; background-size:20px 20px; vertical-align:middle; margin-right:8px;}
.shop-list {}
.shop-list li {text-align:center;padding:20px 0;}
.shop-list li p {text-align:left;color:#7A7878; text-indent:2em;}
.shop-list li img {margin:0 auto;}
.content-contact {color:#F15050;padding:20px 10px;line-height:30px;text-indent:2em;}
.cmbc-qrcode {text-align:center;padding:20px 0;}
.down-cmbc {text-align:center;display:block;margin:0 auto;}
.down-cmbc img {margin:0 auto;}
/*
@media screen and (min-width: 480px) {
.doc {
font-size: 21px
}
}@media screen and (min-width: 640px) {
.doc {
font-size: 28px
}
}
*/
.list li{display:-moz-box;
display:-webkit-box;
display:box;}
.list li p{ width:90%}
.last{ text-align:right ; font-size:12px; color:#bdbdbd; padding-right:20px; margin-bottom:10px;}