方法一：自己手写reset.css

html,
body,
div,
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,
caption {
  margin: 0;
  padding: 0;
  border: 0;
  outline: 0;
  font-size: 100%;
  vertical-align: baseline;
  background: transparent;
}

table,
tbody,
tfoot,
thead,
tr,
th,
td {
  margin: 0;
  padding: 0;
  outline: 0;
  font-size: 100%;
  vertical-align: baseline;
  background: transparent;
}

button,
input,
textarea {
  margin: 0;
  padding: 0;
}

/* form elements 表单元素 */
body,
button,
input,
select,
textarea {
  font: normal 12px/1.5 '\5FAE\8F6F\96C5\9ED1', tahoma, arial;
}

/*设置的字体，行高*/
h1,
h2,
h3,
h4,
h5,
h6,
th {
  font-size: 100%;
  font-weight: normal;
}

/*重置标题*/
address,
cite,
dfn,
var {
  font-style: normal;
}

/* 将斜体扶正 */
code,
kbd,
pre,
samp {
  font-family: 'courier new', courier, monospace;
}

/* 统一等宽字体 */
small {
  font-size: 12px;
}

/* 小于 12px 的中文很难阅读，让 small 正常化 */
ul,
ol {
  list-style: none;
}

/* 重置列表元素 */
button,
input[type="submit"],
input[type="button"] {
  cursor: pointer;
}

input[type="radio"],
input[type="checkbox"],
input[type="submit"],
input[type="reset"] {
  vertical-align: middle;
  cursor: pointer;
  border: none;
}

/** 重置文本格式元素 **/
a {
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
a:focus {
  outline: 0;
}
sup {
  vertical-align: text-top;
}

/* 重置，减少对行高的影响 */
sub {
  vertical-align: text-bottom;
}

/** 重置表单元素 **/
legend {
  color: #000;
}

/* for ie6 */
fieldset,
img {
  border: 0;
}

/* img 搭车：让链接里的 img 无边框 */
button,
input,
select,
textarea {
  background: transparent;
  font-size: 100%;
  outline: 0;
}

/* 使得表单元素在 ie 下能继承字体大小 */
/* 注：optgroup 无法扶正 */
table {
  border-collapse: collapse;
  border-spacing: 0;
}

td,
th {
  vertical-align: middle;
}

/** 重置表格元素 **/
/* 重置 HTML5 元素 */
article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
menu,
nav,
section,
summary,
time,
mark,
audio,
video {
  display: block;
  margin: 0;
  padding: 0;
}

/*回复标签重置*/
blockquote,
q {
  quotes: none;
}

blockquote:before,
blockquote:after,
q:before,
q:after {
  content: '';
  display: none;
}