front-page-phpにかけているコードが機能しない

front-page.phpにかけているcssが機能しないです。
下のコードがfooterphpです。
header.phpにかけているcssは機能します。
原因が全くわかりません

php
1<footer>
2    <div class="left-footer">
3
4        <div class="footer-list">
5            <h1>PADIダイビングショップ<span>SEA</span></h1>
6            <p>PADI DIVINGSHOP SEA</p>
7        </div>
8        <div class="footer-list2">
9            <div class="footer-list2-title">
10                <p>【岩槻本社】</p>
11                <p>【久喜事務所】</p>
12            </div>
13                <div class="footer-list2-title2">
14                    <p>〒346-0011</p>
15                    <p>〒346-0011</p>
16                </div>
17                    <div class="footer-list2-title3">
18                        <p>埼玉県さいたま市岩槻区大字末田1500-1</p>
19                        <p>埼玉県久喜市青毛3丁目</P>
20                    </div>
21        </div>
22    </div>
23                <div class="footer-list3">
24                    <div class="footer-list3-title4">
25                        <div class="footer-list3-logo">
26                            <img src="<?php echo get_template_directory_uri();
27                            ?>/img/受話器.png"  alt="">
28                        </div>
29                        <div class="footer-list3-logo2">
30                            <h1>048-791-7103</h1>
31                        </div>
32                    </div>
33                    <div class="footer-list3-img">
34                            <div class="footer-list3-sentence1">
35                                <p>＜営業時間＞</p>
36                                <p>土日祝日</p>
37                                <p>9:30~17:30</p>
38                            </div>
39                                <div class="footer-list3-sentence2">
40                                    <p>*営業時間外にお問合せの場合</p>
41                                    <p>E-mail →→→ info@ceg.jp</p>
42                                </div>
43                    </div>
44                </div>
45</footer>

style.css
1footer{
2  background:#dbedf0;
3  color: blue;
4  padding-top: 20px;
5  font-family: sans-serif;
6  text-align: center;
7 }
8 @media screen and (max-width: 768px){
9  footer{
10    margin-top: 20px;
11  }
12}
13.main-footer{
14 position: relative;
15 width: 100%;
16 background:#dbedf0;
17  color: blue;
18  padding-top: 20px;
19  font-family: sans-serif;
20  text-align: center;
21}
22@media screen and (max-width: 768px){
23  .main-footer{
24    top: 10px;
25  }
26}
27.left-footer,.footer-list3{
28 display: inline-block;
29}
30.left-footer{
31  margin-right: 50px;
32}
33@media screen and (max-width: 768px){
34  .left-footer{
35    margin-right:0px;
36    width: 100%;
37  }
38}
39 .footer-list{
40  text-align: center;
41 }
42 @media screen and (max-width: 768px){
43  .footer-list{
44     display: none;
45  }
46}
47 .footer-list h1{
48  font-size: 20px;
49 }
50 .footer-list span{
51   font-size: 35px;
52   margin: 0 25px;
53 }
54 .footer-list p{
55  font-size: 12px;
56 }
57 .footer-list2{
58   margin-top: 20px;
59   text-align: left;
60   font-size: 14px;
61 }
62 @media screen and (max-width: 768px){
63  .footer-list2{
64    margin-top: 0px;
65  }
66 }
67 .footer-list2-title,.footer-list2-title2,.footer-list2-title3{
68  display: inline-block;
69  margin: 0px 20px;
70 }
71 @media screen and (max-width: 768px){
72  .footer-list2-title3{
73    display: block;
74  }
75  .footer-list2-title{
76    float: left;
77    width: 45%;
78    margin: 0px;
79    margin-left: 5%;
80  }
81  .footer-list2-title2{
82    text-align: right;
83    width: 45%;
84    margin: 0px;
85    margin-right: 5%;
86  }
87  .footer-list2-title3{
88    text-align: center;
89    margin-top: 20px;
90  }
91 }
92 .footer-list3{
93  margin-left: 50px;
94 }
95 @media screen and (max-width: 768px){
96   .footer-list3{
97     margin-left: 0px;
98   }
99 }
100 .footer-list3-logo img{
101  width: 70px;
102  vertical-align: -25px;
103    transform: rotate(-5deg);
104}
105.footer-list3-logo{
106  display: inline-block;
107}
108.footer-list3-title4{
109  color: yellow;
110  text-shadow: black 2px 2px 7px;
111}
112.footer-list3-logo2{
113  display: inline-block;
114  font-size: 20px;
115}
116.footer-list3-title4{
117 margin-top: 10px;
118}
119.footer-list3-img{
120 margin:10px 0px;
121}
122.footer-list3-sentence,.footer-list3-sentence1,.footer-list3-sentence2{
123 display: flex;
124}
125.footer-list3-sentence p,.footer-list3-sentence1 p,.footer-list3-sentence2 p{
126  margin: 0px 10px;
127 }
128 @media screen and (max-width: 768px){
129  .footer-list3-sentence p,.footer-list3-sentence1 p,.footer-list3-sentence2 p{
130    font-size: 12px;
131  }
132 }
133.footer-list3-sentence{
134 margin-left: 150px;
135}