css怎么初始化？

(1)先访问京东 > 找到第一个css，搜索body，将初始样式扣下来

* {
margin: 0;
padding: 0;
box-sizing: border-box;
}

em,
i {
font-style: normal
}

li {
list-style: none
}

img {
border: 0;
vertical-align: middle
}

button {
cursor: pointer
}

a {
color: #666;
text-decoration: none
}

a:hover {
color: #c81623
}

button,
input {
font-family: Microsoft YaHei, Heiti SC, tahoma, arial, Hiragino Sans GB, "\5B8B\4F53", sans-serif
}

body {
-webkit-font-smoothing: antialiased;
background-color: #fff;
font: 12px/1.5 Microsoft YaHei, Heiti SC, tahoma, arial, Hiragino Sans GB, "\5B8B\4F53", sans-serif;
color: #666
}

.hide,
.none {
display: none
}

.clearfix:after {
visibility: hidden;
clear: both;
display: block;
content: ".";
height: 0
}