我正在尝试使背景图像缩放到移动和桌面。
此代码可在桌面上运行：
/*
* Globals
*/
/* Links */
a,
a:focus,
a:hover {
color: #fff;
}
/* Custom default button */
.btn-default,
.btn-default:hover,
.btn-default:focus {
color: #333;
text-shadow: none; /* Prevent inheritence from `body` */
background-color: #fff;
border: 1px solid #fff;
}
/*
* Base structure
*/
html,
body {
height: 100%;
background-color: #333;
}
body {
color: #fff;
text-align: center;
text-shadow: 0 1px 3px rgba(0,0,0,.5);
box-shadow: inset 0 0 100px rgba(0,0,0,.5);
}
/* Extra markup and styles for table-esque vertical and horizontal centering */
.site-wrapper {
display: table;
width: 100%;
height: 100%; /* For at least Firefox */
min-height: 100%;
}
.site-wrapper-inner {
display: table-cell;
vertical-align: top;
}
.cover-container {
margin-left: auto;
margin-right: auto;
}
/* Padding for spacing */
.inner {
padding: 30px;
}
/*
* Header
*/
.masthead-brand {
margin-top: 10px;
margin-bottom: 10px;
}
.masthead-nav > li {
display: inline-block;
}
.masthead-nav > li + li {
margin-left: 20px;
}
.masthead-nav > li > a {
padding-left: 0;
padding-right: 0;
font-size: 16px;
font-weight: bold;
color: #fff; /* IE8 proofing */
color: rgba(255,255,255,.75);
border-bottom: 2px solid transparent;
}
.masthead-nav > li > a:hover,
.masthead-nav > li > a:focus {
background-color: transparent;
border-bottom-color: rgba(255,255,255,.25);
}
.masthead-nav > .active > a,
.masthead-nav > .active > a:hover,
.masthead-nav > .active > a:focus {
color: #fff;
border-bottom-color: #fff;
}
@media (min-width: 768px) {
.masthead-brand {
float: left;
}
.masthead-nav {
float: right;
}
}
/*
* Cover
*/
.cover {
padding: 0 20px;
}
.cover .btn-lg {
padding: 10px 20px;
font-weight: bold;
}
/*
* Footer
*/
.mastfoot {
color: #999; /* IE8 proofing */
color: rgba(255,255,255,.5);
}
/*
* Affix and center
*/
@media (min-width: 768px) {
/* Pull out the header and footer */
.masthead {
position: fixed;
top: 0;
}
.mastfoot {
position: fixed;
bottom: 0;
}
/* Start the vertical centering */
.site-wrapper-inner {
vertical-align: middle;
}
/* Handle the widths */
.masthead,
.mastfoot,
.cover-container {
width: 100%; /* Must be percentage or pixels for horizontal alignment */
}
}
@media (min-width: 992px) {
.masthead,
.mastfoot,
.cover-container {
width: 700px;
}
}
而此代码在移动设备上：
/*
* Globals
*/
/* Links */
a,
a:focus,
a:hover {
color: #fff;
}
/* Custom default button */
.btn-default,
.btn-default:hover,
.btn-default:focus {
color: #333;
text-shadow: none; /* Prevent inheritence from `body` */
background-color: #fff;
border: 1px solid #fff;
}
/*
* Base structure
*/
html,
body {
height: auto%;
background-color: #333;
}
body {
color: #fff;
text-align: center;
text-shadow: 0 1px 3px rgba(0,0,0,.5);
box-shadow: inset 0 0 100px rgba(0,0,0,.5);
}
/* Extra markup and styles for table-esque vertical and horizontal centering */
.site-wrapper {
display: table;
width: auto;
height: auto; /* For at least Firefox */
min-height: auto;
}
.site-wrapper-inner {
display: table-cell;
vertical-align: auto;
}
.cover-container {
margin-left: auto;
margin-right: auto;
}
/* Padding for spacing */
.inner {
padding: 30px;
}
/*
* Header
*/
.masthead-brand {
margin-top: 10px;
margin-bottom: 10px;
}
.masthead-nav > li {
display: inline-block;
}
.masthead-nav > li + li {
margin-left: 20px;
}
.masthead-nav > li > a {
padding-left: 0;
padding-right: 0;
font-size: 16px;
font-weight: bold;
color: #fff; /* IE8 proofing */
color: rgba(255,255,255,.75);
border-bottom: 2px solid transparent;
}
.masthead-nav > li > a:hover,
.masthead-nav > li > a:focus {
background-color: transparent;
border-bottom-color: rgba(255,255,255,.25);
}
.masthead-nav > .active > a,
.masthead-nav > .active > a:hover,
.masthead-nav > .active > a:focus {
color: #fff;
border-bottom-color: #fff;
}
@media (min-width: 768px) {
.masthead-brand {
float: left;
}
.masthead-nav {
float: right;
}
}
/*
* Cover
*/
.cover {
padding: 0 20px;
}
.cover .btn-lg {
padding: 10px 20px;
font-weight: bold;
}
/*
* Footer
*/
.mastfoot {
color: #999; /* IE8 proofing */
color: rgba(255,255,255,.5);
}
/*
* Affix and center
*/
@media (min-width: 768px) {
/* Pull out the header and footer */
.masthead {
position: fixed;
top: 0;
}
.mastfoot {
position: fixed;
bottom: 0;
}
/* Start the vertical centering */
.site-wrapper-inner {
vertical-align: middle;
}
/* Handle the widths */
.masthead,
.mastfoot,
.cover-container {
width: 100%; /* Must be percentage or pixels for horizontal alignment */
}
}
@media (min-width: 992px) {
.masthead,
.mastfoot,
.cover-container {
width: 700px;
}
}
唯一的区别是移动版本上事物的宽度和高度设置为自动。我需要使网站的背景比例达到两者的水平，同时仍保持良好外观。
我正在通过bootstrap（getbootstrap.com/examples/cover/）使用封面模板（如果有CSS和HTML，就可以使用它）。
最好的祝福，
吉尔库拉纳
不确定这是否是您想要的，但是这就是我的方法。
首先，设置html文件和正文，使其始终为100％
body {
height: 100%;
width: 100%;
}
html {
height: 100%;
overflow-x: hidden;
}
然后是您的着陆页类，该类还充当了您想要始终居中显示的内容的容器，无论屏幕大小如何。
.landing {
display: table;
height: 100%;
width: 100%;
position: relative;
background: url(imagefile) no-repeat center center;
background-color: #7fbbda; //Put a color here so when your image is loading, your content has a temporary background
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
.landing .text-container { //this is the container for your text contents
display: table-cell;
vertical-align: middle;
text-align: center;
}
这就是您的html文件的外观
<div class="landing">
<div class="text-container">
<h1>Text</h1>
...
</div>
</div>
这对于任何设备均可正确渲染
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