效果图：
SDGIF_Rusult_1.gif
代码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
.loading {
position: relative;
width: 2.5em;
height: 2.5em;
transform: rotate(165deg);
}
.loading:before, .loading:after {
content: '';
position: absolute;
top: 50%;
left: 50%;
display: block;
width: 0.5em;
height: 0.5em;
border-radius: 0.25em;
transform: translate(-50%, -50%);
}
.loading:before {
animation: before 2s infinite;
}
.loading:after {
animation: after 2s infinite;
}
@keyframes before {
0% {
width: 0.5em;
box-shadow: 1em -0.5em rgba(225, 20, 98, 0.75), -1em 0.5em rgba(111, 202, 220, 0.75);
}
35% {
width: 2.5em;
box-shadow: 0 -0.5em rgba(225, 20, 98, 0.75), 0 0.5em rgba(111, 202, 220, 0.75);
}
70% {
width: 0.5em;
box-shadow: -1em -0.5em rgba(225, 20, 98, 0.75), 1em 0.5em rgba(111, 202, 220, 0.75);
}
100% {
box-shadow: 1em -0.5em rgba(225, 20, 98, 0.75), -1em 0.5em rgba(111, 202, 220, 0.75);
}
}
@keyframes after {
0% {
height: 0.5em;
box-shadow: 0.5em 1em rgba(61, 184, 143, 0.75), -0.5em -1em rgba(233, 169, 32, 0.75);
}
35% {
height: 2.5em;
box-shadow: 0.5em 0 rgba(61, 184, 143, 0.75), -0.5em 0 rgba(233, 169, 32, 0.75);
}
70% {
height: 0.5em;
box-shadow: 0.5em -1em rgba(61, 184, 143, 0.75), -0.5em 1em rgba(233, 169, 32, 0.75);
}
100% {
box-shadow: 0.5em 1em rgba(61, 184, 143, 0.75), -0.5em -1em rgba(233, 169, 32, 0.75);
}
}
.loading {
position: absolute;
top: calc(50% - 1.25em);
left: calc(50% - 1.25em);
}
</style>
</head>
<body>
<div class="loading"></div>
</body>
</html>
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