vscode: Unknown wordが解決できない

前提

Build and Deploy Ecommerce Website With HTML CSS JavaScript | Responsive Shopping Website Part 2 の　16:39で問題が発生しました。
https://www.youtube.com/watch?v=99muDSuP55s&t=592s&ab_channel=Tech2etc

実現したいこと

#prodetailsを効かせたいです
お手本のコードです。

発生している問題・エラーメッセージ

widthが効きません,,,

sproduct.htmlからコピペしたのでスペルミスはないのですがこれが消えません。

該当のソースコード

sproduct.html
1<!DOCTYPE html>
2<html lang="en">
3
4<head>
5    <meta charset="UTF-8">
6    <meta http-equiv="X-UA-Compatible" content="IE=edge">
7    <meta name="viewport" content="width=device-width, initial-scale=1.0">
8    <title>Tech2etc E-commerce Tutorial</title>
9
10    <!-- font awesome -->
11    <script src="https://kit.fontawesome.com/3715e2b643.js" crossorigin="anonymous"></script>
12
13    <!-- bootstrap -->
14    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet"
15        integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
16
17        <link rel="stylesheet" href="style.css">
18        <link rel="stylesheet" href="styleshop.css">
19
20
21</head>
22
23<body>
24
25
26
27    <section id="header">
28        <a href="#"><img class="logo" src="./img/logo.png" alt=""></a>
29
30
31        <div class="">
32            <ul id="navbar">
33                <li><a href="index.html">Home</a></li>
34                <li><a class="active" href="shop.html">Shop</a></li>
35                <li><a href="blog.html">Blog</a></li>
36                <li><a href="about.html">About</a></li>
37                <li><a class="contact" href="contact.html">Contact</a></li>
38                <li id="lg-bag"><a class="cart" href="cart.html"><i class="fa-solid fa-bag-shopping"></i></a></li>
39                <a href="#" id="close"><i class="fa-solid fa-xmark"></i></a>
40            </ul>
41        </div>
42        <div id="mobile">
43            <a class="cart" href="cart.html"><i class="fa-solid fa-bag-shopping"></i></a>
44            <i class="fa-solid fa-outdent" id="bar"></i>
45        </div>
46    </section>
47
48    <section id="prodetails" class="section-p1">
49        <div class="single-pro-image">
50            <img src="./img/products/f1.jpg"  alt="" id="MainImg">
51
52            <div class="small-img-group">
53                <!-- 📄pr2 15:43この中にもまたdiv作るんだあ　保護？ -->
54                <div class="small-img-col">
55                    <img src="./img/products/f1.jpg" alt="" width="100%" class="small-img">
56                </div>
57                <div class="small-img-col">
58                    <img src="./img/products/f2.jpg" alt="" width="100%" class="small-img">
59                </div>
60                <div class="small-img-col">
61                    <img src="./img/products/f3.jpg" alt="" width="100%" class="small-img">
62                </div>
63                <div class="small-img-col">
64                    <img src="./img/products/f4.jpg" alt="" width="100%" class="small-img">
65                </div>
66            </div>
67        </div>
68    </section>
69
70
71    <section id="newsletter" class="section-p1 section-m1">
72
73
74        <div class="newstext">
75            <h4>Sign Up For Newsletters</h4>
76            <p>Get E-mail updates about our latest shop and <span> special offers</span></p>
77        </div>
78        <div class="form">
79            <input type="text" placeholder="Your email address">
80            <button class="normal">Sign Up</button>
81        </div>
82    </section>
83
84    <footer class="section-p1">
85        <!-- 📄colだけでおｋ -->
86        <div class="col col-lg-4">
87            <img class="logo" src="./img/logo.png" alt="">
88            <h4>Contact</h4>
89            <p><strong>Address:</strong> 562 Wellington Road, Street 32, San Francisco</p>
90            <p><strong>Phone:</strong>+01 2222 365/(+91) 01 2345 6789</p>
91            <p><strong>Hours:</strong> 10:00-18:00, Mon - Sat</p>
92
93            <div class="follow">
94                <h4>Follow Us</h4>
95                <div class="icon">
96                    <i class="fa-brands fa-facebook-f"></i>
97                    <i class="fa-brands fa-twitter"></i>
98                    <i class="fa-brands fa-instagram"></i>
99                    <i class="fa-brands fa-pinterest-p"></i>
100                    <i class="fa-brands fa-youtube"></i>
101                </div>
102            </div>
103        </div>
104
105        <div class="col col-lg-2">
106            <h4>About</h4>
107            <a href="#">About Us</a>
108            <a href="#">Delivery Information</a>
109            <a href="#">Privacy Policy</a>
110            <a href="#">Terms & Conditions</a>
111            <a href="#">Contact Us</a>
112        </div>
113
114        <div class="col col-lg-2">
115            <h4>My Account</h4>
116            <a href="#">Sign In</a>
117            <a href="#">View Cart </a>
118            <a href="#">My Wishlist</a>
119            <a href="#">Track My Order</a>
120            <a href="#">Help</a>
121        </div>
122
123        <div class="col col-lg-4 install">
124            <h4>Install App</h4>
125            <p>From App Store or Google Play</p>
126            <div class="container-fluid">
127                <div class="row">
128                    <img src="./img/pay/app.jpg" alt="">
129                    <img src="./img/pay/play.jpg" alt="">
130                </div>
131            </div>
132            <p>Secured Payment Gateways</p>
133            <img src="./img/pay/pay.png" alt="">
134        </div>
135
136        <div class="copyright">
137            <p>@2021, Tech2 etc - HTML CSS Ecommerce Template</p>
138        </div>
139    </footer>
140
141
142
143    <script src="script.js"></script>
144</body>
145
146</html>

styleshop.css
1:root {
2    --baseblue: #088178;
3    --border: #cce7d0;
4}
5
6
7
8
9
10#page-header {
11    background-image: url(./img/banner/b1.jpg);
12    width: 100%;
13    height: 40vh;
14    background-size: cover;
15    display: flex;
16    justify-content: center;
17    flex-direction: column;
18
19
20    /* align-items: center; =したと同じ*/
21    text-align: center;
22}
23
24#page-header h2, 
25#page-header p {
26    color: #fff;
27}
28
29#pagination {
30    text-align: center;
31}
32
33
34#pagination a {
35    text-decoration: none;
36    background-color: var(--baseblue);
37    border-radius: 4px;
38    color: #fff;
39    padding: 15px 20px;
40    font-weight: 600;
41}
42
43#pagination a i {
44    font-weight: 600;
45    font-size: 16px;
46}
47
48
49/* ⭐⭐sproduct.html */
50
51
52
53#prodetails .single-pro-img {
54    width: 40%;
55    margin-right: 50px;
56    box-sizing: border-box;
57}
58
59.small-img-group  img {
60    width: 20%;
61    display: flex;
62    justify-content: space-between;
63    flex-direction: column;
64}
65