实用的CSS代码片段

 三角形列表项目符号

ul {
		     margin: 0.75em 0;
		     padding: 0 1em;
		     list-style: none;
		 }
		 li:before {
		     content: "";
		     border-color: transparent #111;
		     border-style: solid;
		     border-width: 0.35em 0 0.35em 0.45em;
		     display: block;
		     height: 0;
		     width: 0;
		     left: -1em;
		     top: 0.9em;
		     position: relative;
		 }

全站变灰

html {
		 filter: grayscale(100%);
		 -webkit-filter: grayscale(100%);
		 -moz-filter: grayscale(100%);
		 -ms-filter: grayscale(100%);
		 -o-filter: grayscale(100%);
		 filter: url("data:image/svg+xml;utf8,#grayscale");
		 filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
		 -webkit-filter: grayscale(1);
		 }