自動デプロイ後にCSSが反映されない時の対処法を実践してみたがエラーが発生しました。

Question

前提・実現したいこと

ここに質問の内容を詳しく書いてください。
自動デプロイした後、Githubでmasterにアップした後、
EC2で自動デプロイするとCSSが表示されなくなった。

発生している問題・エラーメッセージ

[ec2-user@ip-172-31-45-251 nostalgia]$ sudo less /var/log/nginx/error.log
2020/11/16 07:37:24 [error] 29011#0: *555 open() "/var/www/nostalgia/public/assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css" failed (2: No su
ch file or directory), client: 103.5.140.149, server: 54.248.24.69, request: "GET /assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css HTTP/1.1",
 host: "54.248.24.69", referrer: "http://54.248.24.69/"
2020/11/16 07:37:32 [error] 29011#0: *555 open() "/var/www/nostalgia/public/assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css" failed (2: No su
ch file or directory), client: 103.5.140.149, server: 54.248.24.69, request: "GET /assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css HTTP/1.1",
 host: "54.248.24.69", referrer: "http://54.248.24.69/"
2020/11/16 07:37:34 [error] 29011#0: *557 open() "/var/www/nostalgia/public/assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css" failed (2: No su
ch file or directory), client: 103.5.140.149, server: 54.248.24.69, request: "GET /assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css HTTP/1.1",
 host: "54.248.24.69", referrer: "http://54.248.24.69/"
2020/11/16 07:38:09 [error] 29011#0: *555 open() "/var/www/nostalgia/public/assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css" failed (2: No su
ch file or directory), client: 103.5.140.149, server: 54.248.24.69, request: "GET /assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css HTTP/1.1",
 host: "54.248.24.69", referrer: "http://54.248.24.69/"
2020/11/16 07:38:36 [error] 29011#0: *557 open() "/var/www/nostalgia/public/assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css" failed (2: No su
ch file or directory), client: 103.5.140.149, server: 54.248.24.69, request: "GET /assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css HTTP/1.1",
 host: "54.248.24.69", referrer: "http://54.248.24.69/items"
2020/11/16 07:38:44 [error] 29011#0: *555 open() "/var/www/nostalgia/public/assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css" failed (2: No su
ch file or directory), client: 103.5.140.149, server: 54.248.24.69, request: "GET /assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css HTTP/1.1",
 host: "54.248.24.69", referrer: "http://54.248.24.69/items"
2020/11/16 07:38:55 [error] 29011#0: *557 open() "/var/www/nostalgia/public/assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css" failed (2: No su
ch file or directory), client: 103.5.140.149, server: 54.248.24.69, request: "GET /assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css HTTP/1.1",
 host: "54.248.24.69", referrer: "http://54.248.24.69/items"
2020/11/16 07:40:11 [error] 29011#0: *584 open() "/var/www/nostalgia/public/assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css" failed (2: No su
ch file or directory), client: 103.5.140.149, server: 54.248.24.69, request: "GET /assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css HTTP/1.1",
 host: "54.248.24.69", referrer: "http://54.248.24.69/items"
2020/11/16 07:41:12 [error] 29011#0: *585 open() "/var/www/nostalgia/public/assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css" failed (2: No su
ch file or directory), client: 103.5.140.149, server: 54.248.24.69, request: "GET /assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css HTTP/1.1",
 host: "54.248.24.69", referrer: "http://54.248.24.69/users/1"
2020/11/16 07:41:34 [error] 29011#0: *584 open() "/var/www/nostalgia/public/assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css" failed (2: No su
ch file or directory), client: 103.5.140.149, server: 54.248.24.69, request: "GET /assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css HTTP/1.1",
 host: "54.248.24.69", referrer: "http://54.248.24.69/"
2020/11/16 07:41:37 [error] 29011#0: *585 open() "/var/www/nostalgia/public/assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css" failed (2: No su
ch file or directory), client: 103.5.140.149, server: 54.248.24.69, request: "GET /assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css HTTP/1.1",
 host: "54.248.24.69", referrer: "http://54.248.24.69/"
2020/11/16 07:42:20 [error] 29011#0: *584 open() "/var/www/nostalgia/public/assets/application-bd27d8a19976d1f442130770741a52ef0e54af51b09d239d898a2c593a0957ab.css" failed (2: No su

多過ぎたので残りはスクリーンショット
https://gyazo.com/abdca666a20d3bbd142b152260e832b8

該当のソースコード

@ -445,11 +445,11 @@ i {
  transition-timing-function: ease-in;
}

/* .button {
.button {
  background-image: -moz-linear-gradient(top, rgba(255, 255, 255, 0.05) 1%, rgba(0, 0, 0, 0.2) 100%);
  background-image: -webkit-linear-gradient(top, rgba(255, 255, 255, 0.05) 1%, rgba(0, 0, 0, 0.2) 100%);
  background-image: linear-gradient(to bottom, rgba(255, 255, 255, 0.05) 1%, rgba(0, 0, 0, 0.2) 100%);
} */
}

ul {
  margin: 0;
@ -648,16 +648,9 @@ body {
h1,
h2,
h3,


h4,
body {
  text-align: center;
  color: #666;
  font-size: 18px;
}


h5,
h6,
body {
  line-height: 1.57;
  letter-spacing: 0.15em;
@ -665,26 +658,8 @@ body {
  color: #666;
  font-family: 'Unica One', "Avenir", "游ゴシック", "YuGothic", "ヒラギノ角ゴ Pro W6", "HIragino Kaku Gothic Pro W6", "HIragino Kaku Gothic Pro", Osaka, Meiryo, "メイリオ", "ＭＳ Ｐゴシック", "MS P Gothic", sans-serif;
  margin: 0;
  text-align: center;
}

h5,
body {
  font-size: px;
  color: #666;
  
  margin: 0;
  text-align: center;
}


h6,
body {
  margin : 50px 100px;
  text-align: left;
}


a {
  text-decoration: none;
  color: #666;
@ -707,9 +682,9 @@ div.contents.row div.content_post p {
  font-size: 2em !important;
}

/* ::selection {
::selection {
  background: #D8D8D8;
} */
}

.transition,
a,
@ -751,7 +726,7 @@ header.header div.header__bar.row div.grid-6 a.post:hover {
}

.title--big {
  font-size: 2.5em;
  font-size: 1.5em;
  font-weight: bold;
}

@ -847,10 +822,10 @@ header.header .user_nav ul li a {
  border-bottom: 1px solid #d8d8d8;
}

/* .form {
.form {
  background: url(https://dl.dropboxusercontent.com/u/5840617/DeathtoStock_Wired3.jpg);
  background-size: cover;
} */
}

.form .contents {
  position: absolute;
@ -885,16 +860,14 @@ div.contents.row .new_user {

div.contents.row div.content_post {
  margin: 20px 0;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 30px;
  position: relative;
  height: 400px;
  color: #fff;
  /* background-size: cover;
  background-position: center center; */
  background-size: cover;
  background-position: center center;
  border-radius: 3px;
  /* box-shadow: 0 0 10px rgba(41, 41, 41, 0.2); */
  box-shadow: 0 0 10px rgba(41, 41, 41, 0.2);
}

div.contents.row div.content_post:after {
@ -1091,17 +1064,4 @@ footer p {
  /* object-fit: contain; */
  /* background: cover; */
  max-height: 100%;
}

 .a {
  font-size: 3em;
  letter-spacing: -2px;
  margin-bottom: 30px;
  text-align: center;
}

.p{
  font-size: 1.1em;
  line-height: 1.7em;
  margin: 0 0 10px;

試したこと

IPアドレスを開くとCSSが表示されず、
一度、EC2でps aux | grep unicornで立ち上がっているものをkillして、
RAILS_SERVE_STATIC_FILES=1 unicorn_rails -c config/unicorn.rb -E production -Dで立ち上げて、ローカル上でbundle exec cap production deployを行い、
再度、IPアドレスを開いたのですが、結果は変わりませんでした。

補足情報（FW/ツールのバージョンなど）

ローカル環境では問題なく、WEBサイトは起動出来ていました。

WEBサイトのスクリーンショット
https://gyazo.com/2661a271f9bd7df9941ea37f6e8b9577

Answer 1

原因は突き止めれいないですが、
CSSをデプロイした段階にcommand＋zで元に戻し、
自動デプロイさせたら、問題なくWEBアプリを開くことに成功しました。
お騒がしてしまいすみません。