效果：
源码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>123</title>
<style>
body {
margin: 0;
padding: 0;
background: #f9f9f9;
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
}
.row {
display: flex;
padding: 30px;
gap: 30px;
flex-wrap: wrap;
background: inherit;
}
.box {
position: relative;
width: 500px;
height: 250px;
border-radius: 20px;
background-color: inherit;
}
.btn {
display: inline-flex;
padding: 12px 20px;
justify-content: center;
align-items: center;
color: white;
text-decoration: none;
background-color: #000521;
border-radius: 80px;
}
.btn-decor-wrap {
position: absolute;
left: 0;
bottom: 0;
display: inline-block;
padding: 24px 24px 0 0;
margin: 24px 24px 0 0;
border-top-right-radius: 45px;
background-color: inherit;
}
.btn-decor-wrap:after,
.btn-decor-wrap:before {
z-index: 0;
position: absolute;
display: block;
width: 24px;
height: 24px;
content: '';
clip-path: polygon(0.082%0%, 0%0%, 0%100%, 100%100%, 100%99.918%, 100%99.918%, 84.085%98.066%, 68.994%93.913%, 54.912%87.642%, 42.022%79.44%, 30.51%69.49%, 20.56%57.978%, 12.358%45.088%, 6.088%31.006%, 1.934%15.915%, 0.082%0%);
background-color: inherit;
overflow: hidden;
}
.btn-decor-wrap:before {
top: -24px;
left: 0;
}
.btn-decor-wrap:after {
right: -24px;
bottom: 0;
}
</style>
</head>
<body>
<div class="row">
<div class="box" style="background-image: url('https://img-home.csdnimg.cn/images/20250224104257.png');background-size: cover;background-position: center;">
<span class="btn-decor-wrap">
<a href="#" class="btn">了解更多</a>
</span>
</div>
</div>
</body>
</html>
