html,
body,
ol,
ul,
li,
h1,
h2,
h3,
h4,
h5,
h6,
p,
th,
td,
dl,
dd,
form,
fieldset,
legend,
input,
textarea,
select,
div,
section,
span,
i {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/*这里不要用通配符*{margin:0;padding:0;}因为会遍及所有元素*/
html {
  font-size: 100px;
}

/*设置html根标签的字号大小为100px；为了使用rem；可以等比例放大缩小整体比例*/
body {
  font-family: "PingFangSC-Regular, PingFang SC, Microsoft Yahei";
  box-sizing: border-box;
}

b,
strong {
  font-weight: normal;
}

i,
em {
  font-style: normal;
}

ul,
ol,
li {
  list-style: none;
}

a,
u {
  text-decoration: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-size: 0.16rem;
  font-weight: normal;
}

img {
  border: 0;
  display: block;
}

input,
fieldset {
  outline: none;
  border: 0;
}

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

/*万能清浮动*/
.clear_fix {
  zoom: 1;
}