HTML/CSS 标题格式问题

Question

我正在开展一个元素，其中包括创建网络应用程序。目前，我专注于网站的总体设计和布局。首先，我想要在顶部有一个水平的深灰色标题。在其下方，我想要两列，一列带有导航栏，一列包含内容。

Actual result

Desired result

下面是我的代码，我不确定是什么导致顶部的黑色标题没有显示。

完整的 CSS 文件:https://pastebin.com/kpUHV71Z

<section class="management">
    <div class="header-div">
        <img src="Golf.png" class="management-logo" height="50" width="50">
        <h1 class="impact" id="management-header">Management Dashboard</h1>
    </div>
    <div class="left left-nav">
        <ul>
            <li><a href="#home">Home</a></li>
            <li><a href="#news">News</a></li>
            <li><a href="#contact">Contact</a></li>
            <li><a href="#about">About</a></li>
        </ul>
    </div>
    <div class="right">
        <h3>Staff</h3>
    </div>
    <div class="clear"></div>
</section>

Answer 1

您需要为标题分配显示和宽度

.header-div {
    background-color: #555555;
    border-radius: 5px;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
    height: auto;
     width: 100%;
    display: inline-block;
}

这将使标题表现为一个 block 并让您调整导航

希望这就是您要找的。如果需要，很乐意解释或提供更好的解决方案。

body {
    text-align: center;
    background-image: url("background.jpg");
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center center;
    font-family: verdana;
}
 
.selection-menu {
    margin-top: 50px;
}
 
#special-button {
    margin-top: 100px;
    margin-left: 200px;
}
#special-button2 {
    margin-top: 100px;
    margin-left: 400px;
}
 
#header {
    margin-top: 10px;
    font-weight: bold;
    font-size: 60px;
    color: white;
}
 
#author {
    font-weight: normal;
    font-size: 25px;
    margin-top: -40px;
    color: white;
    padding-bottom: 20px;
}
 
.club-selection {
    font-weight: bold;
    margin-top: 20px;
    font-size: 50px;
}
 
.input-header {
    font-weight: bold;
    margin-top: 20px;
    font-size: 50px;
}
 
.impact {
    font-family: Montserrat;
}
 
.index-section {
    background-color: rgb(242,242,242);
    border-radius: 5px;
    width: 50%;
    margin: auto;
    padding-bottom: 25px;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
    margin-top: 50px;
}
 
table {
    border-collapse: collapse;
    margin: auto;
    margin-top: 10px;
}
 
table td, table th {
    border: 1px solid lightgrey;
    padding: 2px;
}
 
.management {
    background-color: rgb(242,242,242);
    border-radius: 5px;
    width: 90%;
    margin: auto;
    padding-bottom: 25px;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
    margin-top: 50px;
}
 
h3 {
    font-size: 40px;
    font-family: Montserrat;
    margin-bottom: 10px;
}
 
.separate {
    width: 95%;
    margin: auto;
    margin-top: 20px;
    margin-bottom: -30px;
}
 
.buttongroup {
    display: inline;
}
 
input {
    display: inline;
}
 
button {
    background-color: #555555;
    border: none;
    color: white;
    padding: 7px 16px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    border-radius: 5px;
}
 
button:hover {
    background-color: lightgrey;
    color: black;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}
 
input {
    border: none;
    height: 3%;
}
 
#appdescription {
    margin-top: 40px;
    margin-bottom: -10px;
}
 
.inline-alignment {
    display: inline;
    margin-bottom: 20px;
}
 
img {
    margin-left: 20px;
}
 
.header-div {
    background-color: #555555;
    border-radius: 5px;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
    height: auto;
     width: 100%;
    display: inline-block;
}
 
.left {
    width: 25%;
    float: left;
}
 
.right {
    margin-left: 25%;
}
 
.clear {
    clear: both;
}
 
.management-logo {
    float: left;
    clear: right;
    margin-right: 20px;
}
 
#management-header {
    margin-top: 10px;
    font-weight: bold;
    font-size: 30px;
    color: white;
    float: left;
    margin: 0;
}
 
ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    width: 200px;
    background-color: grey;
}
 
li a {
    display: block;
    color: #000;
    padding: 8px 16px;
    text-decoration: none;
}
 
li a:hover {
    background-color: #555;
    color: white;
}
 
.left-nav {
    background-color: grey;
}

<section class="management">
    <div class="header-div">
        <img src="Golf.png" class="management-logo" height="50" width="50">
        <h1 class="impact" id="management-header">Management Dashboard</h1>
    </div>
    <div class="left left-nav">
        <ul>
            <li><a href="#home">Home</a></li>
            <li><a href="#news">News</a></li>
            <li><a href="#contact">Contact</a></li>
            <li><a href="#about">About</a></li>
        </ul>
    </div>
    <div class="right">
        <h3>Staff</h3>
    </div>
    <div class="clear"></div>
</section>