css中如何让背景图片透明

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
       .btn{
           width: 100px;
           height: 50px;
           background-color: #cc0000;
           color: #ffffff;
           line-height: 50px;
           text-align: center;

       }
        .arrow{
            display: inline-block;
            width: 10px;
            height: 10px;
            background-color: red;
            background: url("./img/icon.png") 0px -355px  no-repeat;
        }
    </style>
</head>
<body>
    <div class="btn">
        测试
 <span class="arrow"></span>
    </div>
</body>
</html>

这是这样背景图

我要求不高，只要能在谷歌和火狐浏览器里面背景能透明即可

很着急，请各位大神帮我看看如何处理

feibenren

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