안녕하세요. 제가 여행 사이트의 실습과제(https://www.codeit.kr/learn/courses/web-publishing/541)와 이번 포트폴리오를 응용해서

저만의 웹사이트를 구축하려 합니다.

그런데 html을 불러올 시, 하얀 바탕화면의 사진만 불러와지고 아무런 표시가 안나는데

도무지 어디서 잘못됬는지 잘 모르겠습니다.

한번만 봐주실 수 있을까요?

<웹페이지 이미지>

index.html

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/html">
<head>
     <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"
          integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"
            integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q"
            crossorigin="anonymous"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
            integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
            crossorigin="anonymous"></script>



    <title>포트폴리오</title>
    <meta charset="utf-8">
    <link rel="stylesheet" href="css/webmonitor.css">
    <link href="https://fonts.googleapis.com/earlyaccess/notosanskr.css" rel="stylesheet">
</head>
</head>
<body>
  <!-- navigation bar -->
  <div class="navbar">
    <img src="images/webmonitor_format.jpg" width="34" height="34">
    <ul class="menu-right">
      <li><button id="about-btn">About</button>
      <li><button id="contact-btn">Contact</button>
    </ul>
  </div>

  <section class="header">
    <div class="helper"></div><div class="vertical-center">
      <h1>I'm an engineer</h1>
      <h2>FRONT-END DEVELOPER</h2>
  </div>

    <div id="menu">
      <a href="#"><b>Intro</b></a>
      <a href="message.html">MESSAGE</a>
      <a href="hlr.html">AUTH</a>
      <a href="int.html">INTELLIGENT</a>
      <a href="thingplug.html">IOT</a>
    </div>
  </section>

  <section>
    <div class="status" id="message_table">
            <table class="table">
            <thead>
            <tr>
                <th scope="col">NO</th>
                <th scope="col">상태</th>
                <th scope="col">Hostname</th>
                <th scope="col">위치</th>
                <th scope="col">IP</th>
                <th scope="col">CPU온도</th>
                <th scope="col">CPU사용률</th>
                <th scope="col">DISK사용률</th>
                <th scope="col">Memory사용률</th>
                <th scope="col">장애로그</th>
                <th scope="col">장비상세정보</th>
            </tr>
            </thead>
        </table>
    </div>
  </section>



  <!-- about me -->
  <section class="about">
    <div class="helper"></div><div class="vertical-center">
      <h3>About Me</h3>
      <p>안녕하세요. 저는 프론트엔드와 백엔드를 넘나드는 개발자입니다. 만나서 반가워요!</p>

      <div class="skillset">
        <div class="skill">
          <div class="title">HTML5</div>

          <div class="bar">
            <div class="inner-bar"></div>

            <span class="percentage">90%</span>
          </div>
        </div>

        <div class="skill">
          <div class="title">CSS3</div>

          <div class="bar">
            <div class="inner-bar"></div>

            <span class="percentage">90%</span>
          </div>
        </div>

        <div class="skill">
          <div class="title">jQuery</div>

          <div class="bar">
            <div class="inner-bar"></div>

            <span class="percentage">85%</span>
          </div>
        </div>

        <div class="skill">
          <div class="title">Python</div>

          <div class="bar">
            <div class="inner-bar"></div>

            <span class="percentage">75%</span>
          </div>
        </div>

        <div class="skill">
          <div class="title">Rails</div>

          <div class="bar">
            <div class="inner-bar"></div>

            <span class="percentage">70%</span>
          </div>
        </div>

        <div class="skill">
          <div class="title">Sketch</div>

          <div class="bar">
            <div class="inner-bar"></div>

            <span class="percentage">90%</span>
          </div>
        </div>
      </div>
    </div>
  </section>

  <!-- contact me -->
  <section class="contact">
    <div class="helper"></div><div class="vertical-center">
      <h3>Contact Me</h3>
      <p>언제든지 편하게 연락주세요. 감사합니다.</p>

      <form>
        <input type="text" name="name" placeholder="NAME">
        <input type="email" name="email" placeholder="EMAIL">
        <textarea type="text" name="message" placeholder="MESSAGE"></textarea>
      </form>
    </div>
  </section>

  <script
    src="https://code.jquery.com/jquery-3.2.1.min.js"
    integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4="
    crossorigin="anonymous"></script>
  <script src="js/webmonitor_format.js"></script>
</body>
</html>

webmonitor.css

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Noto Sans KR', sans-serif;
  min-width: 768px;
}

/* navbar */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 60px;
  line-height: 60px;
  padding: 0 60px;
}

.navbar img {
  vertical-align: middle;
}

.navbar .menu-right {
  float: right;
  padding: 0;
  margin: 0;
  list-style: none;
}

.navbar .menu-right li {
  float: left;
}

.navbar .menu-right li button {
  color: white;
  font-size: 16px;
  font-weight: 300;
  text-decoration: none;
  transition: color 1s;
  padding: 0;
  background-color: transparent;
  border: none;
  outline: none;
  cursor: pointer;
}

.navbar .menu-right li:last-child {
  margin-left: 30px;
}

/* vertical center */

.helper {
  display: inline-block;
  height: 100%;
  vertical-align: middle;
}

.vertical-center {
  display: inline-block;
  vertical-align: middle;
  color: white;
  opacity: 0;
  position: relative;
  top: 100px;
}

/* header */

.header {
  background-image: url('../images/hero_background.jpg');
  background-size: cover;
  background-position: center center;
  height: 100vh;
  min-height: 600px;
  text-align: center;
}

.header h1 {
  font-size: 40px;
  margin: 0;
  margin-bottom: 33px;
}

.header h2 {
  font-size: 20px;
  margin: 0;
  font-weight: normal;
}

/* about */

.about {
  height: 100vh;
  min-height: 600px;
  text-align: center;
}

.about h3 {
  font-size: 40px;
  color: #4a4a4a;
  margin: 0;
  margin-bottom: 37px;
}

.about p {
  font-size: 16px;
  color: #4a4a4a;
  margin: 0;
  margin-bottom: 61px;
}

.about .skillset {
  display: inline-block;
}

.about .skill:not(:last-child) {
  margin-bottom: 17px;
}

.about .skill .title {
  display: inline-block;
  width: 50px;
  vertical-align: middle;
  margin-right: 15px;
  font-size: 16px;
  color: #4a4a4a;
}

.about .skill .bar {
  display: inline-block;
  vertical-align: middle;
  width: 646px;
  height: 33px;
  border-radius: 25px;
  background-color: #f9f9f9;
  position: relative;
  line-height: 33px;
}

.about .skill .bar .inner-bar {
  position: absolute;
  top: 0;
  left: 0;
  height: 33px;
  background: #bbe6ff;
  border-radius: 25px;
}

.about .skill .bar .percentage {
  font-size: 14px;
  color: #9b9b9b;
  position: absolute;
  right: 20px;
  top: 0;
}

/* contact */

.contact {
  height: 100vh;
  min-height: 600px;
  background-color: #f9f9f9;
  text-align: center;
}

.contact h3 {
  font-size: 40px;
  color: #4a4a4a;
  margin: 0;
  margin-bottom: 37px;
}

.contact p {
  font-size: 16px;
  color: #4a4a4a;
  margin: 0;
  margin-bottom: 61px;
}

.contact form {
  display: inline-block;
  vertical-align: middle;
  width: 646px;
}

.contact input,
.contact textarea {
  display: block;
  width: 100%;
  border-radius: 4px;
  border: solid 1px #ebebeb;
  font-size: 16px;
  padding: 10px 30px;
}

.contact input {
  margin-bottom: 24px;
}

.contact textarea {
  resize: none;
  height: 222px;
}

#logo {
  display: block;
  margin-left: auto;
  margin-right: auto;
  margin-top: 80px;
}

#menu {
  text-align: center;
  margin-top: 60px;
  margin-bottom: 60px;
}

#menu a {
  margin-left: 10px;
  margin-right: 10px;
  font-size: 16px;
  color: #58595b;
  text-decoration: none;
  font-family: Helvetica, Arial, sans-serif;
}

#photo {
  display: block;
  margin-left: auto;
  margin-right: auto;
}