css3 上锯齿边框只有半个
<!DOCTYPE html><html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
.bg1 {
height: 50px;
background-image: -webkit-gradient(linear, 50% 0, 0 100%, from(transparent), color-stop(.5, transparent), color-stop(.5, #f5f5f5), to(#f5f5f5)), -webkit-gradient(linear, 50% 0, 100% 100%, from(transparent), color-stop(.5, transparent), color-stop(.5, #f5f5f5), to(#f5f5f5));
background-size: 7px 5px;
background-repeat: repeat-x;
background-position: 0 100%;
}
.bg2 {
height: 50px;
background-image: -webkit-gradient(linear, 50% 0, 0 100%, from(#f5f5f5), color-stop(.5, #f5f5f5), color-stop(.5, transparent), to(transparent)), -webkit-gradient(linear, 50% 0, 0 100%, from(#f5f5f5), color-stop(.5, #f5f5f5), color-stop(.5, transparent), to(transparent));
background-size: 7px 5px;
background-repeat: repeat-x;
background-position: 0 0;
}
.gray {
height: 24px;
background: #f5f5f5;
}
</style>
</head>
<body>
<div class="bg1"></div>
<div class="gray"></div>
<div class="bg2"></div>
</body>
</html>bg2的上的锯齿如何变得完整，它只有半个，如何像bg1那样完整，但是他是在上边，bg1是在下边，麻烦大家帮我看一下是哪里出错了，谢谢
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