我的选框是圆圈，怎么样才能是方块？
<form>
<lable>你对什么运动感兴趣：</lable>
<br />
<label for="male">慢跑</label>
<input type="radio" name="gender" id="male" />
<br />
<label for="female">登山</label>
<input type="radio" name="gender" id="female" />
<br />
<label for="email">篮球</label>
<input type="radio" name="gender" id="email" />
</form>
