怎么调整成正方形框框
<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>
</head>
<body>
<form>
<label for="wocao">慢跑</label>
<input type="radio" name="gender" id="wocao">
<br/>
<label for="ganma">登山</label>
<input type="radio" name="gender" id="ganma">
<br/>
<label for="zheyang">篮球</label>
<input type="radio" name="gender" id="zheyang">
</form>
</body>
</html>
