<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<style type="text/css">
div {
position: relative;
line-height: 30px;
}
input[type="radio"] {
width: 20px;
height: 20px;
opacity: 0;
}
label {
position: absolute;
left: 5px;
top: 8px;
width: 20px;
height: 20px;
border-radius: 50%;
border: 1px solid #999;
}
/* 这只check 之后的样式 */
input:checked+label {
background-color: #0090FF;
border: 1px solid #0090FF;
}
input:checked+label::after {
position: absolute;
content: "";
width: 5px;
height: 10px;
top: 3px;
left: 6px;
border: 2px solid #fff;
border-top: none;
border-left: none;
transform: rotate(45deg)
}
</style>
<body>
<form>
<div>
<input id="nan" type="radio" name="sex" checked>
<label for="nan"></label>
<span style="margin-left: 10px">男</span>
</div>
<div>
<input id="nv" type="radio" name="sex">
<label for="nv"></label>
<span style="margin-left: 10px">女</span>
</div>
</form>
</body>
</html>