CSS
body {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
background: url(http://lorempixel.com/420/255) no-repeat center center fixed;
background-size: cover;
}
body:before {
left: 0;
right: 0;
margin-left:auto;
margin-right:auto;
content: "";
position: absolute;
height: 100%;
width: 500px;
background: url(http://lorempixel.com/420/255) no-repeat center center fixed;
background-size: cover;
z-index: -1;
filter: blur(5px);
-webkit-filter: blur(5px);
}
div {
height: 100%;
width: 450px;
margin: 0 auto;
}
filter: blur()
(加上厂商前缀)。模糊仅适用于元素本身,而不适用于其下面的任何内容,因此您需要在“模糊框”内引用图像以及在背景中使用background-position
来控制偏移量,以便它们正确对齐。.blur {
background-image: url('http://placekitten.com/400/400');
background-position: center -100px;
-webkit-filter: blur(10px);
-moz-filter: blur(10px);
-o-filter: blur(10px);
-ms-filter: blur(10px);
filter: blur(10px);
filter: blur(10px);
}