css3箭头悬浮
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>無標題文檔</title>
<style>
body{background:#000;
}.footer_img {position: absolute;bottom: 8%;left: 45%;animation:arrowing 3s infinite;
}@keyframes arrowing {0% {transform: translateY(-5px);opacity: .8}50% {transform: translateY(10px);opacity: 1}to {transform: translateY(-5px)}
}.footer_img img{width:40px;
}
</style>
</head><body>
<div class="footer_img"><img src="data:image/png;base64,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">
</div>
</body>
</html>
效果圖：
總結
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