效果图：
完整代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>脉动圆形加载动画</title>
<style type="text/css">
body {
background: #ECF0F1;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
margin: 0;
}
.pulsing-circle {
width: 50px;
height: 50px;
background-color: #3498db;
border-radius: 50%;
animation: pulse 1s infinite;
}
@keyframes pulse {
0% {
transform: scale(1);
opacity: 1;
}
50% {
transform
