为什么 CSS 没有加载到"post.html"上？

我正在做一个100天的code: Python Pro Bootcamp项目。这是我的Python Flask应用程序。我遇到的问题是，当我运行代码时，所有页面都成功显示CSS，除了"post.html"页面。

import json
from flask import Flask, render_template
URL = "https://api.npoint.io/aa42b8bd75db3f736ba8"
app = Flask(__name__)

@app.route('/')
def home():
response = requests.get(URL)
data = response.json()
return render_template('index.html', data=data)

@app.route('/about')
def about():
return render_template('about.html')

@app.route('/contact')
def contact():
return render_template('contact.html')

@app.route('/post/<int:post_id>')
def post(post_id):
response = requests.get(URL)
data = response.json()
post_data = None
for item in data:
if item['id'] == post_id:
post_data = item
break
return render_template('post.html', post_data=post_data)

if __name__ == '__main__':
app.run(debug=True, host='localhost')
# TODO. Stuck on enabling the CSS on the posts.html.

这是索引html。

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
<meta name="description" content="" />
<meta name="author" content="" />
<title>Clean Blog - Start Bootstrap Theme</title>
<link rel="icon" type="image/x-icon" href="assets/favicon.ico" />
<!-- Font Awesome icons (free version)-->
<script src="https://use.fontawesome.com/releases/v6.3.0/js/all.js" crossorigin="anonymous"></script>
<!-- Google fonts-->
<link href="https://fonts.googleapis.com/css?family=Lora:400,700,400italic,700italic" rel="stylesheet" type="text/css" />
<link href="https://fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800" rel="stylesheet" type="text/css" />
<!-- Core theme CSS (includes Bootstrap)-->
<link href="static/css/styles.css" type="text/css" rel="stylesheet"/>
<!-- Javascript-->
<link href="js/scripts.js" rel="stylesheet"/>
</head>
<!-- Navigation-->
<nav class="navbar navbar-expand-lg navbar-light" id="mainNav">
<!--        <nav class="navbar navbar-expand-lg navbar-light" style="position: fixed; top: 0; left: 0; right: 0; z-index: 9999;" id="mainNav">-->
<div class="container px-4 px-lg-5">
<a class="navbar-brand" href="index.html">Start Bootstrap</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
Menu
<i class="fas fa-bars"></i>
</button>
<div class="collapse navbar-collapse" id="navbarResponsive">
<ul class="navbar-nav ms-auto py-4 py-lg-0">
<li class="nav-item"><a class="nav-link px-lg-3 py-3 py-lg-4" href="index.html">Home</a></li>
<li class="nav-item"><a class="nav-link px-lg-3 py-3 py-lg-4" href="{{ url_for('about')}}">About</a></li>
<li class="nav-item"><a class="nav-link px-lg-3 py-3 py-lg-4" href="{{ url_for('contact') }}">Contact</a></li>
</ul>
</div>
</div>
</nav>
<body>
<!-- Page Header-->
<header class="masthead" style="background-image: url('static/assets/img/home-bg.jpg')">
<div class="container position-relative px-4 px-lg-5">
<div class="row gx-4 gx-lg-5 justify-content-center">
<div class="col-md-10 col-lg-8 col-xl-7">
<div class="site-heading">
<h1>Clean Blog</h1>
<span class="subheading">A Blog Theme by Start Bootstrap</span>
</div>
</div>
</div>
</div>
</header>
<!-- Main Content-->
<div class="container px-4 px-lg-5">
<div class="row gx-4 gx-lg-5 justify-content-center">
<div class="col-md-10 col-lg-8 col-xl-7">
<!-- Post preview-->
{% for item in data %}
<div class="post-preview">
<a href="{{ url_for('post',post_id=item['id'])}}">
<!--                        <a href="post.html">-->
<h2 class="post-title">{{ item['title']}}</h2>
<h3 class="post-subtitle">{{ item['subtitle']}}</h3>
</a>
<p class="post-meta">
Posted by
<a href="#!">{{ item['author']}}</a>
on {{ item['date']}}
</p>
</div>
{% endfor %}
<!-- Pager-->
<div class="d-flex justify-content-end mb-4"><a class="btn btn-primary text-uppercase" href="#!">Older Posts →</a></div>
</div>
</div>
</div>
{% include "footer.html" %}

下面是我的post html。

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
<meta name="description" content="" />
<meta name="author" content="" />
<title>Clean Blog - Start Bootstrap Theme</title>
<link rel="icon" type="image/x-icon" href="assets/favicon.ico" />
<!-- Font Awesome icons (free version)-->
<script src="https://use.fontawesome.com/releases/v6.3.0/js/all.js" crossorigin="anonymous"></script>
<!-- Google fonts-->
<link href="https://fonts.googleapis.com/css?family=Lora:400,700,400italic,700italic" rel="stylesheet" type="text/css" />
<link href="https://fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800" rel="stylesheet" type="text/css" />
<!-- Core theme CSS (includes Bootstrap)-->
<link href="css/styles.css" type="text/css" rel="stylesheet"/>
</head>
<body>
<!-- Navigation-->
<nav class="navbar navbar-expand-lg navbar-light" id="mainNav">
<div class="container px-4 px-lg-5">
<a class="navbar-brand" href="index.html">Start Bootstrap</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
Menu
<i class="fas fa-bars"></i>
</button>
<div class="collapse navbar-collapse" id="navbarResponsive">
<ul class="navbar-nav ms-auto py-4 py-lg-0">
<li class="nav-item"><a class="nav-link px-lg-3 py-3 py-lg-4" href="index.html">Home</a></li>
<li class="nav-item"><a class="nav-link px-lg-3 py-3 py-lg-4" href="about.html">About</a></li>
<li class="nav-item"><a class="nav-link px-lg-3 py-3 py-lg-4" href="post.html">Sample Post</a></li>
<li class="nav-item"><a class="nav-link px-lg-3 py-3 py-lg-4" href="contact.html">Contact</a></li>
</ul>
</div>
</div>
</nav>
<!-- Page Header-->
<header class="masthead" style="background-image: url('assets/img/post-bg.jpg')">
<div class="container position-relative px-4 px-lg-5">
<div class="row gx-4 gx-lg-5 justify-content-center">
<div class="col-md-10 col-lg-8 col-xl-7">
<div class="post-heading">
<h1>{{post_data['title']}}</h1>
<h2 class="subheading">{{post_data['subtitle']}}</h2>
<span class="meta">
Posted by
<a href="#!">{{post_data['author']}}</a>
on {{post_data['date']}}
</span>
</div>
</div>
</div>
</div>
</header>
<!-- Post Content-->
<article class="mb-4">
<div class="container px-4 px-lg-5">
<div class="row gx-4 gx-lg-5 justify-content-center">
<div class="col-md-10 col-lg-8 col-xl-7">
<p>{{post_data['body']}}</p>
</div>
</div>
</div>
</article>
<!-- Footer-->
<footer class="border-top">
<div class="container px-4 px-lg-5">
<div class="row gx-4 gx-lg-5 justify-content-center">
<div class="col-md-10 col-lg-8 col-xl-7">
<ul class="list-inline text-center">
<li class="list-inline-item">
<a href="#!">
<span class="fa-stack fa-lg">
<i class="fas fa-circle fa-stack-2x"></i>
<i class="fab fa-twitter fa-stack-1x fa-inverse"></i>
</span>
</a>
</li>
<li class="list-inline-item">
<a href="#!">
<span class="fa-stack fa-lg">
<i class="fas fa-circle fa-stack-2x"></i>
<i class="fab fa-facebook-f fa-stack-1x fa-inverse"></i>
</span>
</a>
</li>
<li class="list-inline-item">
<a href="#!">
<span class="fa-stack fa-lg">
<i class="fas fa-circle fa-stack-2x"></i>
<i class="fab fa-github fa-stack-1x fa-inverse"></i>
</span>
</a>
</li>
</ul>
<div class="small text-center text-muted fst-italic">Copyright &copy; Your Website 2023</div>
</div>
</div>
</div>
</footer>
<!-- Bootstrap core JS-->
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/js/bootstrap.bundle.min.js"></script>
<!-- Core theme JS-->
<script src="js/scripts.js"></script>
</body>
</html>

我试着修改<link href="css/styles.css" type="text/css" rel="stylesheet"/>行，但没有成功。有人知道如何让CSS加载到页面上吗?

调用css时缺少静态字

<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
<meta name="description" content="" />
<meta name="author" content="" />
<title>Clean Blog - Start Bootstrap Theme</title>
<link rel="icon" type="image/x-icon" href="assets/favicon.ico" />
<!-- Font Awesome icons (free version)-->
<script src="https://use.fontawesome.com/releases/v6.3.0/js/all.js" crossorigin="anonymous"></script>
<!-- Google fonts-->
<link href="https://fonts.googleapis.com/css?family=Lora:400,700,400italic,700italic" rel="stylesheet" type="text/css" />
<link href="https://fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800" rel="stylesheet" type="text/css" />
<!-- Core theme CSS (includes Bootstrap)-->
<link href="static/css/styles.css" type="text/css" rel="stylesheet"/>
</head>

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