<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>复选框效果</title>
<style>
form{border: 1px solid #ccc;padding: 20px;width: 300px;margin: 30px auto;}
.wrapper{margin-bottom: 10px;}
.box{display: inline-block;position: relative;width: 20px;height: 20px;border: 2px solid orange;}
.box input{position: absolute;top: 0;left: 0;top: -3px;left: -4px;width: 21px;height: 21px; opacity: 0;cursor: pointer;z-index: 5; }
.box span{position: absolute;top: 1px; right: 6px;font-size: 19px;font-weight: bold;font-family: Arial; -webkit-transform: rotate(18deg); -moz-transform: rotate(18deg); -ms-transform: rotate(18deg); -o-transform: rotate(18deg); transform: rotate(18deg);color: orange;}
input[type="checkbox"]+span{opacity: 0;}
input[type="checkbox"]:checked+span{opacity: 1;}
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</style>
</head>
<body>
<form action="#">
<div class="wrapper">
<div class="box">
<input type="checkbox" checked id="userName" /><span>√</span>
</div>
<label for="userName">我是选中状态</label>
</div>
<div class="wrapper">
<div class="box">
<input type="checkbox" id="userNum" /><span>√</span>
</div>
<label for="userNum">我是未选中状态</label>
</div>
</form>
</body>
</html>