<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
#preloader{
position:relative;
width: 28px;
height: 28px;
transform: rotate(45deg);
animation: preloader 1.2s infinite linear;
}
#preloader span{
width: 10px;
height: 10px;
position:absolute;
background:#1890ff;
border-radius: 100%;
display:block;
transform-origin: 50% 50%;
opacity: .3;
animation: preloader_span 1.2s infinite linear;
}
#preloader span:nth-child(1){
top: 0;
left: 0;
}
#preloader span:nth-child(2){
top: 0;
right: 0;
animation-delay: 0.4s;
}
#preloader span:nth-child(3){
right: 0;
bottom: 0;
animation-delay: 0.8s;
}
#preloader span:nth-child(4){
bottom: 0;
left: 0;
animation-delay: 1.2s;
}
@keyframes preloader {
from { transform: rotate(0deg); }
to { transform: rotate(360deg); }
}
@keyframes preloader_span {
0% { opacity: .3; }
50% { opacity: 1; }
100% { opacity: .3; }
}
</style>
</head>
<body>
<div id="preloader">
<span></span>
<span></span>
<span></span>
<span></span>
</div>
</body>
</html>