（reset.css）

@charset "utf-8";

html {
  background-color: #fff;
  color: #000;
  font-size: 12px
}

body,
ul,
ol,
dl,
dd,
h1,
h2,
h3,
h4,
h5,
h6,
figure,
form,
fieldset,
legend,
input,
textarea,
button,
p,
blockquote,
th,
td,
pre,
xmp {
  margin: 0;
  padding: 0
}

body,
input,
textarea,
button,
select,
pre,
xmp,
tt,
code,
kbd,
samp {
  line-height: 1.5;
  font-family: tahoma, arial, "Hiragino Sans GB", simsun, sans-serif
}

h1,
h2,
h3,
h4,
h5,
h6,
small,
big,
input,
textarea,
button,
select {
  font-size: 100%
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: tahoma, arial, "Hiragino Sans GB", "微软雅黑", simsun, sans-serif
}

h1,
h2,
h3,
h4,
h5,
h6,
b,
strong {
  font-weight: normal
}

address,
cite,
dfn,
em,
i,
optgroup,
var {
  font-style: normal
}

table {
  border-collapse: collapse;
  border-spacing: 0;
  text-align: left
}

caption,
th {
  text-align: inherit
}

ul,
ol,
menu {
  list-style: none
}

fieldset,
img {
  border: 0
}

img,
object,
input,
textarea,
button,
select {
  vertical-align: middle
}

article,
aside,
footer,
header,
section,
nav,
figure,
figcaption,
hgroup,
details,
menu {
  display: block
}

audio,
canvas,
video {
  display: inline-block;
  *display: inline;
  *zoom: 1
}

blockquote:before,
blockquote:after,
q:before,
q:after {
  content: "\0020"
}

textarea {
  overflow: auto;
  resize: vertical
}

input,
textarea,
button,
select,
a {
  outline: 0 none;
  border: none;
}

  button::-moz-focus-inner,
  input::-moz-focus-inner {
    padding: 0;
    border: 0
  }

mark {
  background-color: transparent
}

a,
ins,
s,
u,
del {
  text-decoration: none
}

sup,
sub {
  vertical-align: baseline
}

html {
  overflow-x: hidden;
  height: 100%;
  font-size: 50px;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: Arial, "Microsoft Yahei", "Helvetica Neue", Helvetica, sans-serif;
  color: #333;
  font-size: .28em;
  line-height: 1;
  -webkit-text-size-adjust: none;
}

hr {
  height: .02rem;
  margin: .1rem 0;
  border: medium none;
  border-top: .02rem solid #cacaca;
}

a {
  color: #25a4bb;
  text-decoration: none;
}

（border.css）

@charset "utf-8";

.border,
.border-top,
.border-right,
.border-bottom,
.border-left,
.border-topbottom,
.border-rightleft,
.border-topleft,
.border-rightbottom,
.border-topright,
.border-bottomleft {
  position: relative;
}

  .border::before,
  .border-top::before,
  .border-right::before,
  .border-bottom::before,
  .border-left::before,
  .border-topbottom::before,
  .border-topbottom::after,
  .border-rightleft::before,
  .border-rightleft::after,
  .border-topleft::before,
  .border-topleft::after,
  .border-rightbottom::before,
  .border-rightbottom::after,
  .border-topright::before,
  .border-topright::after,
  .border-bottomleft::before,
  .border-bottomleft::after {
    content: "\0020";
    overflow: hidden;
    position: absolute;
  }
  /* border
 * 因，边框是由伪元素区域遮盖在父级
 * 故，子级若有交互，需要对子级设置
 * 定位 及 z轴
 */
  .border::before {
    box-sizing: border-box;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    border: 1px solid #eaeaea;
    transform-origin: 0 0;
  }

  .border-top::before,
  .border-bottom::before,
  .border-topbottom::before,
  .border-topbottom::after,
  .border-topleft::before,
  .border-rightbottom::after,
  .border-topright::before,
  .border-bottomleft::before {
    left: 0;
    width: 100%;
    height: 1px;
  }

  .border-right::before,
  .border-left::before,
  .border-rightleft::before,
  .border-rightleft::after,
  .border-topleft::after,
  .border-rightbottom::before,
  .border-topright::after,
  .border-bottomleft::after {
    top: 0;
    width: 1px;
    height: 100%;
  }

  .border-top::before,
  .border-topbottom::before,
  .border-topleft::before,
  .border-topright::before {
    border-top: 1px solid #eaeaea;
    transform-origin: 0 0;
  }

  .border-right::before,
  .border-rightbottom::before,
  .border-rightleft::before,
  .border-topright::after {
    border-right: 1px solid #eaeaea;
    transform-origin: 100% 0;
  }

  .border-bottom::before,
  .border-topbottom::after,
  .border-rightbottom::after,
  .border-bottomleft::before {
    border-bottom: 1px solid #eaeaea;
    transform-origin: 0 100%;
  }

  .border-left::before,
  .border-topleft::after,
  .border-rightleft::after,
  .border-bottomleft::after {
    border-left: 1px solid #eaeaea;
    transform-origin: 0 0;
  }

  .border-top::before,
  .border-topbottom::before,
  .border-topleft::before,
  .border-topright::before {
    top: 0;
  }

  .border-right::before,
  .border-rightleft::after,
  .border-rightbottom::before,
  .border-topright::after {
    right: 0;
  }

  .border-bottom::before,
  .border-topbottom::after,
  .border-rightbottom::after,
  .border-bottomleft::after {
    bottom: 0;
  }

  .border-left::before,
  .border-rightleft::before,
  .border-topleft::after,
  .border-bottomleft::before {
    left: 0;
  }

@media (max--moz-device-pixel-ratio: 1.49), (-webkit-max-device-pixel-ratio: 1.49), (max-device-pixel-ratio: 1.49), (max-resolution: 143dpi), (max-resolution: 1.49dppx) {
  /* 默认值，无需重置 */
}

@media (min--moz-device-pixel-ratio: 1.5) and (max--moz-device-pixel-ratio: 2.49), (-webkit-min-device-pixel-ratio: 1.5) and (-webkit-max-device-pixel-ratio: 2.49), (min-device-pixel-ratio: 1.5) and (max-device-pixel-ratio: 2.49), (min-resolution: 144dpi) and (max-resolution: 239dpi), (min-resolution: 1.5dppx) and (max-resolution: 2.49dppx) {
  .border::before {
    width: 200%;
    height: 200%;
    transform: scale(.5);
  }

  .border-top::before,
  .border-bottom::before,
  .border-topbottom::before,
  .border-topbottom::after,
  .border-topleft::before,
  .border-rightbottom::after,
  .border-topright::before,
  .border-bottomleft::before {
    transform: scaleY(.5);
  }

  .border-right::before,
  .border-left::before,
  .border-rightleft::before,
  .border-rightleft::after,
  .border-topleft::after,
  .border-rightbottom::before,
  .border-topright::after,
  .border-bottomleft::after {
    transform: scaleX(.5);
  }
}

@media (min--moz-device-pixel-ratio: 2.5), (-webkit-min-device-pixel-ratio: 2.5), (min-device-pixel-ratio: 2.5), (min-resolution: 240dpi), (min-resolution: 2.5dppx) {
  .border::before {
    width: 300%;
    height: 300%;
    transform: scale(.33333);
  }

  .border-top::before,
  .border-bottom::before,
  .border-topbottom::before,
  .border-topbottom::after,
  .border-topleft::before,
  .border-rightbottom::after,
  .border-topright::before,
  .border-bottomleft::before {
    transform: scaleY(.33333);
  }

  .border-right::before,
  .border-left::before,
  .border-rightleft::before,
  .border-rightleft::after,
  .border-topleft::after,
  .border-rightbottom::before,
  .border-topright::after,
  .border-bottomleft::after {
    transform: scaleX(.33333);
  }
}