CSS错误显示

Question

我想获取带背景色的Div，并将$graphPhoLink = "https://graph.facebook.com/v2.9/{$albumid}/photos?fields=source,images,name&access_token={$access_token}&limit=500"; 左对齐，将#title左对齐，并将它们都放在一行中。

我无法将它们排成一行！而且我不能给#Header <nav>。

background-color

/* Reset */

html, body, div, h1, h2, h3, a, p, img, ul, li, footer, fieldset, form, label, header, section {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 100%;
  font: inherit;
  vertical-align: baseline;
}

.page {
  background-color: #fff;
}

#banner {
  padding: 8em 0 5em 0;
  height: 75vh;
  background-image: url(images/banner1.jpg);
  background-size: cover;
  background-attachment: fixed;
  background-repeat: no-repeat;
  text-align: center;
  position: relative;
}

#semiopacity {
  background-color: rgba(20, 15, 10, 0.7);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

a {
  margin: 0 0 2em 0;
  font-weight: 700;
  font-size: 20px;
  color: #fff;
  text-decoration: none;
  font-family: Lato, serif;
}

p {
  margin: 0 0 2em 0;
  font-weight: 700;
  font-size: 20px;
  color: #fff;
}

h1,
h2,
h3 {
  font-weight: 700;
  line-height: 1.5;
  margin: 0 0 1em 0;
  font-family: Lato, serif;
  color: #fff;
}

h1 {
  margin-top: 6em;
  font-size: 2em;
  text-align: center;
}

h2 {
  margin-bottom: 2em;
  text-align: center;
  font-size: 1.5em;
}

#header {
  padding: 1em 0 2em 0;
  background: #e6e6e6;
}

nav {
  margin: 0;
  padding: 0;
  text-align: right;
}

#title {
  font-size: 1.3em;
  margin: 1em 1em 0 0;
  text-align: left;
  margin: 0;
}

#main {
  font-size: 1.3em;
  margin: 1em 2em 0 0;
}

#lang {
  font-size: 1.3em;
  margin: 1em 1em 0 0;
}

Answer 1

我试图修复它：

    /* Reset */
html, body, div, h1, h2, h3, a, p, img, ul, li, footer, fieldset, form, label, header, section {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 100%;
  font: inherit;
  vertical-align: baseline;
}

.page {
  background-color: #fff;
}

#banner {
  padding: 8em 0 5em 0;
  height: 75vh;
  background-image: url(images/banner1.jpg);
  background-size: cover;
  background-attachment: fixed;
  background-repeat: no-repeat;
  text-align: center;
  position: relative;
}

#semiopacity {
  background-color: rgba(20, 15, 10, 0.7);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

a {
  margin: 0 0 2em 0;
  font-weight: 700;
  font-size: 20px;
  color: #fff;
  text-decoration: none;
  font-family: Lato, serif;
}

p {
  margin: 0 0 2em 0;
  font-weight: 700;
  font-size: 20px;
  color: #fff;
}

h1,
h2,
h3 {
  font-weight: 700;
  line-height: 1.5;
  margin: 0 0 1em 0;
  font-family: Lato, serif;
  color: #fff;
}

h1 {
  margin-top: 6em;
  font-size: 2em;
  text-align: center;
}

h2 {
  margin-bottom: 2em;
  text-align: center;
  font-size: 1.5em;
}

#header {
  padding: 1em 0 5em 0;
  background-color: rgba(20, 15, 10, 0.7);
}

#nav {
  margin: 0;
  padding: 0;
  text-align: right;
  float: left;
}

#title {
  font-size: 1.3em;
  margin: 0;
}

#main {
  font-size: 1.3em;
  margin: 1em 2em 0 0;
}

#lang {
  font-size: 1.3em;
  margin: 1em 1em 0 0;
}

#buttons {
  font-size: 1.3em;
  margin: 1em 1em 0 0;
  text-align: left;
  margin: 0;
  float: left;
}

<title>KAZAKHSTAN &mdash; world's large center of travel</title>
<meta charset="utf-8">


<div class="page">
  <section id="banner">
    <section id="semiopacity">
      <div id="Header">
        <div id="nav">
          <ol>
            <tr><a id="title" href="#">KAZAKHSTAN</a></tr>
            <tr><a href="#">MAIN</a></tr>
            <tr><a href="contact.html">CONTACT</a></tr>
          </ol>
        </div>

      </div>
      <h1>KAZAKHSTAN</h1>
      <p>KAZAKHSTAN &mdash; WORLD'S LARGE CENTER OF TRAVEL.</p>
    </section>
  </section>
  <section id="description">

  </section>
</div>