<!DOCTYPE html>
//css div代码渐变色
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<style>
		body {
		  background-color: #1e293b;
		  display: flex;
		  justify-content: center;
		  align-items: center;
		  min-height: 100vh;
		  font-family: Helvetica;
		}
		
		.card {
		  width: 400px;
		  height: 400px;
		  position: relative;
		  border-radius: 40px;
		  padding: 40px;
		  box-sizing: border-box;
		  overflow: hidden;
		  box-shadow: inset 0px 0px 40px rgba(0, 0, 0, .8), 0px 8px 20px rgba(0, 0, 0, .6);
		}
		
		.card::after {
		  content: '';
		  position: absolute;
		  top: -300px;
		  right: -300px;
		  bottom: -300px;
		  left: -300px;
		  background: conic-gradient(from 180deg at 50% 50%, #12001B -97.5deg, #000000 14.05deg, #040EFF 54.01deg, #8000FF 113.42deg, #00B6B6 185.62deg, #12001B 262.5deg, #000000 374.05deg);
		filter: blur(60px) brightness(1.5);
		  z-index: -1;
		  animation: 30s move linear infinite;
		}
		
		h2 {
		  margin: 0;
		  padding: 0;
		  font-size: 60px;
		  letter-spacing: -1px;
		  color: #fff;
		  text-shadow: 0px 2px 4px rgba(0, 0, 0, .3);
		}
		
		span {
		  font-size: 50px;
		  font-weight: normal;
		  display: block;
		}
		
		.card > div {
		  background-color: rgba(0, 0, 0, 0.5);
		  padding: 20px 40px;
		  font-size: 32px;
		  position: absolute;
		  bottom: 0;
		  left: 0;
		  right: 0;
		  color: #fff;
		}
		
		@keyframes move {
		  from {
		    transform: rotate(180deg);
		  }
		  to {
		    transform: rotate(540deg);
		  }
		}
	</style>
	<body>
		<div class="card">
		  <h2>React JS<span>Fundamental</span></h2>
		  <div>Learn More</div>
		</div>
	</body>
</html>
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