【发布时间】：2020-09-07 03:17:25
【问题描述】：
尊敬的会员，
.py 文件有以下内容：
from flask import Flask, render_template, flash, session, redirect, url_for
from flask_wtf import FlaskForm
from wtforms import StringField,SubmitField
from wtforms.validators import DataRequired
app = Flask(__name__)
app.config['SECRET_KEY'] = 'kmykey'
class SimpleForm(FlaskForm):
username = StringField("Username:", validators=[DataRequired()])
password = StringField("Password:", validators=[DataRequired()])
submit = SubmitField("Submit")
@app.route('/', methods = ['GET', 'POST'])
def index():
form = SimpleForm()
if form.validate_on_submit():
session['username'] = form.username.data
session['password'] = form.password.data
return redirect(url_for('index'))
return render_template('Login_Page.html', form=form)
if __name__ == '__main__':
app.run()
对应的jinja模板包括：
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title>Ticket Booking</title>
<link rel= "stylesheet" type= "text/css" href= "{{ url_for('static',filename='Login_Page.css') }}">
<link href="https://fonts.googleapis.com/css2?family=Anton&display=swap" rel="stylesheet">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous">
<!-- JS, Popper.js, and jQuery -->
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js" integrity="sha384-OgVRvuATP1z7JjHLkuOU7Xw704+h835Lr+6QL9UvYjZE3Ipu6Tp75j7Bh/kR0JKI" crossorigin="anonymous"></script>
</head>
<body>
<div align="center" class="main1">
<form method="POST">
<h1>Railway Booking Portal</h1>
<h2>Welcome!</h2>
<br>
{# This hidden_tag is a CSRF security feature. #}
{{ form.hidden_tag() }}
{{ form.username.label(class_='uname') }} {{ form.username(placeholder='email here') }}
<br>
{{ form.password.label(class_='passwd') }} {{ form.password() }}
<br>
<a class="abc" href="Sign_Up.html"><u>SignUp</u></a>
<br>
<a class="abc1" href="Password_Reset.html"><u>ForgotPassword</u></a>
<br>
<br>
{{ form.submit() }}
<br>
<p>"One's destination is never a place, but a new way of seeing things." - Henry Miller</p>
</form>
</div>
我成功地将 HTML 与 css 连接起来，并且当应用程序通过 Flask 运行时可以看到背景图像，但是，用户名和密码标签/字段没有被格式化。 css 文件由以下内容组成：
body{
background: url(railway-tracks.jpeg);
background-repeat: no-repeat;
}
h1{
color: black;
}
p{
font-family: 'Anton', sans-serif;
font-size: 200%;
color: black;
}
.uname{
display: inline-block;
min-width: 90px;
color: red;
}
.passwd{
display: inline-block;
min-width: 90px;
color: red;
}
请指导我缺少什么或使用不正确的部分？
谢谢
（更新）
【问题讨论】：
标签： html css flask jinja2 flask-wtforms