先看效果图
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.btn {
width: 55px;
height: 30px;
line-height: 30px;
text-align: center;
border: 1px solid #ccc;
border-radius: 5px;
position: relative;
overflow: hidden;
}
.btn::before {
content: "";
display: block;
width: 200%;
height: 200%;
position: absolute;
left: 50%;
top: 50%;
z-index: -2;
background-color: #000;
transform-origin: 0% 0%;
animation: line 2s linear infinite;
}
.btn::after {
content: "";
display: block;
width: 95%;
height: 95%;
position: absolute;
left: 50%;
top: 50%;
border-radius: 5px;
transform: translate(-50%, -50%);
z-index: -1;
background-color: #ccc;
}
@keyframes line {
0% {
transform: rotate(0deg);
}
100% {
transform: rotate(360deg);
}
}
</style>
</head>
<body>
<div class="btn">
按钮
</div>
</body>
</html>
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