源代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>按钮</title>
<style>
* {
margin: 0;
padding: 0;
}
body {
display: flex;
justify-content: center;
background: black;
align-items: center;
width: 100%;
height: 600px;
}
button {
width: 300px;
height: 80px;
border-radius: 40px;
background: linear-gradientlinear-(60deg, #03a9f4, #f441a5, #ffeb3b, #03a9f4);
text-transform: uppercase;
font-size: 30px;
color: white;
background-size: 400%;
position: relative;
}
button::before {
content: "";
position: absolute;
left: -5px;
top: -5px;
bottom: -5px;
right: -5px;
background: linear-gradient(60deg, #03a9f4, #f441a5, #ffeb3b, #03a9f4);
z-index: -1;
border-radius: 40px;
filter: blur(20px);
background-size: 400%;
}
button:hover::before {
animation: hello 8s infinite;
}
button:hover {
animation: hello 8s infinite;
cursor: pointer;
}
@keyframes hello {
100% {
background-position: -400% 0;
}
}
</style>
</head>
<body>
<button>button</button>
</body>
</html>
演示：
本文详细描述了如何使用HTML和CSS创建一个带有动态线性渐变背景和hover效果的按钮，同时展示了JavaScript在关键帧动画中的应用。
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