html, body, .con {max-width: 640px;margin: auto;min-width: 320px;min-height: 50vh;}
html {
    font-size: 18px;
    font-family: Helvetica,Tahoma,Arial,"Hiragino Sans GB","Hiragino Sans GB W3",STXihei,STHeiti,"Microsoft YaHei",Heiti,SimSun,sans-serif;
    -webkit-font-smoothing: antialiased;
}
body {position: relative;font-size: 12px;line-height: 1px;-webkit-text-size-adjust: none; max-width: 640px;overflow-x: hidden;vertical-align: top;font-family: Arial,Helvetica,sans-serif;}
body, h1, h2, h3, p, div, ol, ul, input, button {margin: 0;padding: 0;}
* {-webkit-box-sizing: border-box;box-sizing: border-box;-webkit-user-select: none;outline: none;-webkit-tap-highlight-color: transparent;}
* {margin: 0;padding: 0;border: 0;}
/* html, body {font-size: 100%;width: 100%;height: 100%;} */
/* body, input, a, select { font: 12px/1.5 "Microsoft Yahei", "Simsun";-webkit-font-smoothing: antialiased;} */