1. 网页变成灰色，对重大事件表示哀悼 5年前 (06-08) TAG：灰色
body * {-webkit-filter: grayscale(100%);-moz-filter: grayscale(100%);-ms-filter: grayscale(100%);-o-filter: grayscale(100%);
body * {-webkit-filter: grayscale(100%);-moz-filter: grayscale(100%);-ms-filter: grayscale(100%);-o-filter: grayscale(100%);