背景的添加和透明化
body:before {
background: url(https://tva1.sinaimg.cn/large/0072Vf1pgy1foxkiqu05cj31hc0u0duy.jpg) center/cover no-repeat;
content: '';
background-repeat: no-repeat;
background-position: center;
opacity: 0.79;
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
z-index: -1;
-webkit-filter: grayscale(40%);
-moz-filter: grayscale(40%);
-ms-filter: grayscale(40%);
-o-filter: grayscale(40%);
filter: grayscale(40%);
filter: gray;
}
插入以上代码至页面定制CSS代码【调节背景透明度:(opacity;n)[n取0~1]】