css标准，我从网易云的nec标准网站，这个网站不错，建议大家可以参考一下css的编写标准

css清楚浏览器默认样式

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/* reset */
html,body,h1,h2,h3,h4,h5,h6,div,dl,dt,dd,ul,ol,li,p,blockquote,pre,hr,figure,table,caption,th,td,form,fieldset,legend,input,button,textarea,menu{margin:0;padding:0;}
header,footer,section,article,aside,nav,hgroup,address,figure,figcaption,menu,details{display:block;}
table{border-collapse:collapse;border-spacing:0;}
caption,th{text-align:left;font-weight:normal;}
html,body,fieldset,img,iframe,abbr{border:0;}
i,cite,em,var,address,dfn{font-style:normal;}
[hidefocus],summary{outline:0;}
li{list-style:none;}
h1,h2,h3,h4,h5,h6,small{font-size:100%;}
sup,sub{font-size:83%;}
pre,code,kbd,samp{font-family:inherit;}
q:before,q:after{content:none;}
textarea{overflow:auto;resize:none;}
label,summary{cursor:default;}
a,button{cursor:pointer;}
h1,h2,h3,h4,h5,h6,em,strong,b{font-weight:bold;}
del,ins,u,s,a,a:hover{text-decoration:none;}
body,textarea,input,button,select,keygen,legend{font:12px/1.14 arial,\5b8b\4f53;color:#333;outline:0;}
body{background:#fff;}
a,a:hover{color:#333;}

css媒体查询

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/* media */
/* 横屏 */
@media screen and (orientation:landscape){
     
}
/* 竖屏 */
@media screen and (orientation:portrait){
     
}
/* 窗口宽度<960,设计宽度=768 */
@media screen and (max-width:959px){
     
}
/* 窗口宽度<768,设计宽度=640 */
@media screen and (max-width:767px){
     
}
/* 窗口宽度<640,设计宽度=480 */
@media screen and (max-width:639px){
     
}
/* 窗口宽度<480,设计宽度=320 */
@media screen and (max-width:479px){
     
}
/* windows UI 贴靠 */
@media screen and (-ms-view-state:snapped){
     
}
/* 打印 */
@media print{
     
}

用于制作邮件内容的HTML模板

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<table width="600" cellpadding="0" cellspacing="0" border="0"><tbody><tr><td>
    <div style="width:600px;text-align:left;font:12px/15px simsun;color:#000;background:#fff;">
         
        <!-- 水平居左的邮件 -->
         
    </div>
</td></tr></tbody></table>
 
<div style="text-align:center;">
    <table width="600" cellpadding="0" cellspacing="0" border="0" style="margin:0 auto;"><tbody><tr><td>
        <div style="width:600px;text-align:left;font:12px/15px simsun;color:#000;background:#fff;">
             
            <!-- 水平居中的邮件 -->
             
        </div>
    </td></tr></tbody></table>
</div>