环绕旋转
html
<body>
<div class='bb'></div>
</body>
css
.bb, .bb::before, .bb::after {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
.bb {
width: 200px;
height: 200px;
margin: auto;
background: #009a61;
color: #009a96;
}
.bb::before, .bb::after {
content: '';
z-index: -1;
margin: -5%;
box-shadow: inset 0 0 0 2px;
animation: clipMe 8s linear infinite;
transition:clip 0.3s;
}
.bb::before {
animation-delay: -4s;
}
@-webkit-keyframes clipMe {
0%, 100% {
clip: rect(0px, 220px, 2px, 0px);
}
25% {
clip: rect(0px, 2px, 220px, 0px);
}
50% {
clip: rect(218px, 220px, 220px, 0px);
}
75% {
clip: rect(0px, 220px, 220px, 218px);
}
}
效果
