注意这几个问题：
1、

<meta http-equiv="X-UA-Compatible" content="IE=edge, chrome=1">
<meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=0">

2、

html, body, p, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, font, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td {font-size: 12px;}

html设定一个字体大小 其他字体使用rem怎么样

1、在你的html文件里面加上<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
2、css文件设置body{font-size:16px;}