看本站logo，代码放css，自定义那里的额外css也行
/* logo扫光 */
.logo{
position:relative;
overflow:hidden;
margin: 0px 0 0 0px;
}
.logo:before{
content:"";
position: absolute;
left: -665px;
top: -460px;
width: 200px;
height: 15px;
background-color: rgba(255,255,255,.5);
-webkit-transform: rotate(-45deg);
-moz-transform: rotate(-45deg);
-ms-transform: rotate(-45deg);
-o-transform: rotate(-45deg);
transform: rotate(-45deg);
-webkit-animation: searchLights 6s ease-in 0s infinite;
-o-animation: searchLights 6s ease-in 0s infinite;
animation: searchLights 6s ease-in 0s infinite;
}
@-moz-keyframes searchLights{
50%{
left: -100px;
top: 0;
}
65%{
left: 120px;
top: 100px;
}
}
@keyframes searchLights{
40%{
left: -100px;
top: 0;
}
60%{
left: 120px;
top: 100px;
}
80%{
left: -100px;
top: 0px;
}
}
/* logo扫光结束 */
