## 添加 Viewport Meta 元素
Viewportmeta元素控制移动端浏览器的宽度和缩放。为了自适应设备的宽度,请将下面一行加入 \<head> 中。
~~~
<meta name="viewport" content="width=device-width, initial-scale=1">
~~~
## 基础
所有模块都是基于Normalize.css构建的。它是我们的基础层,一定程度上保证了跨浏览器的一致性。 您可以使用下面cdn引用她,或者直接复制她。
~~~
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/7.0.0/normalize.min.css" />
~~~
## 代码
~~~
/*! normalize.css v7.0.0 | MIT License | github.com/necolas/normalize.css */
html {
line-height: 1.15;
-ms-text-size-adjust: 100%;
-webkit-text-size-adjust: 100%
}
body {
margin: 0
}
article,
aside,
footer,
header,
nav,
section {
display: block
}
h1 {
font-size: 2em;
margin: .67em 0
}
figcaption,
figure,
main {
display: block
}
figure {
margin: 1em 40px
}
hr {
box-sizing: content-box;
height: 0;
overflow: visible
}
pre {
font-family: monospace, monospace;
font-size: 1em
}
a {
background-color: transparent;
-webkit-text-decoration-skip: objects
}
b,
strong {
font-weight: inherit
font-weight: bolder
}
small {
font-size: 80%
}
audio,
video {
display: inline-block
}
audio:not([controls]) {
display: none;
height: 0
}
img {
border-style: none
}
svg:not(:root) {
overflow: hidden
}
button,
input,
optgroup,
select,
textarea {
font-family: sans-serif;
font-size: 100%;
line-height: 1.15;
margin: 0
}
button,
input {
overflow: visible
}
button,
select {
text-transform: none
}
[type=reset],
[type=submit],
button,
html [type=button] {
-webkit-appearance: button
}
[type=button]::-moz-focus-inner,
[type=reset]::-moz-focus-inner,
[type=submit]::-moz-focus-inner,
button::-moz-focus-inner {
border-style: none;
padding: 0
}
[type=button]:-moz-focusring,
[type=reset]:-moz-focusring,
[type=submit]:-moz-focusring,
button:-moz-focusring {
outline: 1px dotted ButtonText
}
fieldset {
padding: .35em .75em .625em
}
legend {
box-sizing: border-box;
color: inherit;
display: table;
max-width: 100%;
padding: 0;
white-space: normal
}
progress {
display: inline-block;
vertical-align: baseline
}
textarea {
overflow: auto
}
[type=checkbox],
[type=radio] {
box-sizing: border-box;
padding: 0
}
[type=number]::-webkit-inner-spin-button,
[type=number]::-webkit-outer-spin-button {
height: auto
}
[type=search] {
-webkit-appearance: textfield;
outline-offset: -2px
}
[type=search]::-webkit-search-cancel-button,
[type=search]::-webkit-search-decoration {
-webkit-appearance: none
}
::-webkit-file-upload-button {
-webkit-appearance: button;
font: inherit
}
details,
menu {
display: block
}
summary {
display: list-item
}
canvas {
display: inline-block
}
[hidden] {
display: none
}
~~~