大家好，如何纠正此错误，您可以在图像中看到我不想要此边框，但是我一次又一次得到此边框

错误：

我不希望后边框如何解决？

我正在使用Bootstarp

forms.py

class user_buy_form(forms.ModelForm):
    Terms_of_trade = forms.CharField(widget=forms.Textarea)
    class Meta:
        model = user_buy
        widgets = {
            'Currency':forms.Select(attrs={'class':'form-control currency','label':''}),'Bank_Name':forms.TextInput(attrs={'class':'form-control Bank-Name'}),'Min_transaction_limit':forms.TextInput(attrs={'class':'form-control Min-transaction-limit'}),'Max_transaction_limit':forms.TextInput(attrs={'class':'form-control Max-transaction-limit'}),'Terms_of_trade':forms.TextInput(attrs={'class':'form-control Terms-of-trade'}),'payment_method':forms.TextInput(attrs={'class':'form-control payment-method'}),'price':forms.TextInput(attrs={'class':'form-control price'}),'Location':forms.TextInput(attrs={'class':'form-control Location'}),'Trade_limits':forms.TextInput(attrs={'class':'form-control Trade-limits'}),}
        fields = '__all__'
        exclude = ('users',)

这是我的 html文件：

<form class="form-control" method="POST">

    {% csrf_token %}
    {{usr_buy.as_p }}
    <input type="submit" class="btn btn-primary" value="Submit">
</form>

任何帮助都会得到赞赏

谢谢！