在twig中创建表单时指定使用bootstrap样式，但是显示的效果还是默认的效果，这是为什么？
twig代码如下图：
显示的效果如下图：
在symfony后台能看到使用了bootstrap：
请问我哪里写错了，求指点，谢谢了。
回复内容：
twig代码如下图：
显示的效果如下图：
在symfony后台能看到使用了bootstrap：
请问我哪里写错了，求指点，谢谢了。
是因为没有bootstrap的css和js文件引起的，下载bootstrap的css和js文件放到web目录，然后在页面中引用就好了。
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