<!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>按钮边框</title>
<style>
body{
display: flex;
justify-content: center;
align-items: center;
background-color: black;
}
button{
width: 100px;
height: 50px;
/* border:3px solid yellowgreen; */
font-size: 18px;
border-radius: 10px;
color: aqua;
position: relative;
background: rgba(255, 0, 0, 0.3);
/* outline: 4px solid #fff; */
/* border: none; */
/* outline: none; */
overflow: hidden;
}
button::before{
content: " ";
position: absolute;
background-color: red;
width: 100px;
height: 100px;
z-index: -2;
transform-origin: 0 0;
animation: rotate 3s infinite linear;
}
button::after{
content: " ";
position: absolute;
background-color: black;
width: calc(100% - 4px);
height: calc(100% - 4px);
left: 2px;
top: 2px;
border-radius: 10px;
z-index: -1;
}
@keyframes rotate {
to{
transform: rotate(1turn);
}
}
</style>
</head>
<body>
<button>按钮边</button>
</body>
</html>
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