效果 (源码网盘地址在最后)
源码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>双箭头按钮</title>
<link href="./style.css" rel="stylesheet" />
</head>
<body>
<div class="center-con">
<div class="round">
<div id="cta">
<span class="arrow primera next"></span>
<span class="arrow segunda next"></span>
</div>
</div>
</div>