CSS
html {
-webkit-filter: grayscale(100%) !important;
-moz-filter: grayscale(100%) !important;
-ms-filter: grayscale(100%) !important;
-o-filter: grayscale(100%) !important;
filter: grayscale(100%) !important;
filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1) !important;
}
关键在于transform: translate(-50%, -50%);
.centered {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
这两个背景图CSS样式很有用:
background-attachment:fixed, background-size:cover
https://www.w3schools.com/howto/tryit.asp?filename=tryhow_css_parallax_percent
https://www.w3schools.com/CSSref/css3_pr_background-size.asp
width: calc(100% - 100px);
为了便于观察,我把边框尺寸做成不一样。
<div style="position:relative">
<div style="width:100px;height:100px;border:3px solid #f00"> </div>
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