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html - 如何让文本居中以及如何让
成为背景图片？

转载 作者：行者123 更新时间：2023-11-28 04:09:05 25 4
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第一季度

如何使文本居中 <h1>Welcome to Liam Docherty's Digital Portfolio</h1>是否符合导航栏文字？

第二季度

我怎样才能制作一个 <DIV>表示背景图片？

出于各种原因，我不想将第 1 部分作为背景图片，这就是我想要制作 <DIV> 的原因它有自己的背景图片。我尝试使用 HTML div class="hero"></div>使用下面的 CSS。但是，没有任何反应。 

.hero {
      background-image: url("https://static.pexels.com/photos/48727/pexels-photo-48727.jpeg");
      background-attachment: fixed;
    }

HTML

 <body>
        <nav class="navbar navbar-default navbar-fixed-top"> 
            <div class="container-fluid">
                <!-- Brand and toggle get grouped for better mobile display -->
                <div class="navbar-header">
                    <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
                        <span class="sr-only">Toggle navigation</span>
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                    </button>
                    <a class="navbar-brand" href="#"><img src="http://placehold.it/60x60" alt="Your Brand Name"></a>
                    <h1 class="nav-title">Welcome to Liam Docherty's Digital Portfolio</h1>
                </div>

                <!-- Collect the nav links, forms, and other content for toggling -->
                <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
                    <ul class="nav navbar-nav">
                            <li><a href="#">Home</a>
                            </li>
                            <li class="dropdown">
                                <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="true">About Me <span class="caret"></span></a>
                                <ul class="dropdown-menu">
                                    <li><a href="#">Action</a>
                                    </li>
                                    <li><a href="#section3">Contact</a>
                                    </li>
                                    <li><a href="#">Something else here</a>
                                    </li>
                                    <li><a href="#">Separated link</a>
                                    </li>
                                    <li><a href="#">One more separated link</a>
                                    </li>
                                </ul>
                            </li>
                            <li class="dropdown">
                                <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Units <span class="caret"></span></a>
                                <ul class="dropdown-menu">
                                    <li><a href="#">Action</a>
                                    </li>
                                    <li><a href="#">Another action</a>
                                    </li>
                                    <li><a href="#">Something else here</a>
                                    </li>

                                    <li><a href="#">Separated link</a>
                                    </li>

                                    <li><a href="#">One more separated link</a>
                                    </li>
                                </ul>
                            </li>
                            <li><a href="#">Clients</a>
                            </li>
                            <li><a href="#contact-me">Contact Me</a>
                            </li>
                        </ul>
                      </div><!-- /.navbar-collapse -->
                    </div><!-- /.container-fluid -->
        </nav>


    <section id="section1" class="section1">
      <div class="hero"></div>

      <a href="#section2"><i class="fa fa-angle-down" style="font-size:100px;"></i></a>

    </section>
    <section id="section2" class="section2">


      <a href="#contact-me"> <i class="fa fa-angle-down" style="font-size:100px;"></i></a>

    </section>

    <section id="contact-me" class="contact_section section3">

      <a href="#section1"> <i class="fa fa-angle-up" style="font-size:100px;"></i></a>

    </section>
    <script   src="https://code.jquery.com/jquery-3.1.1.js" integrity="sha256-16cdPddA6VdVInumRGo6IbivbERE8p7CQR3HzTBuELA="   crossorigin="anonymous"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

<footer>
    <div class="page">
        <h1 class="footer">Copyright © 2017 Liam Docherty's Site. All rights reserved.</h1>
    </div>
 </footer>     
</body>

CSS

<style>
    body {
      margin: 0;
      padding: 0;
    }
    .navbar.navbar-default {
      background-color: #4D5061;
      height: 10vh;
      z-index: 100;
    }
    .navbar.navbar-default ul {
      list-style-type: none;
      text-align: right;
    }
    .navbar.navbar-default ul li {
      display: inline-block;
    }
    .dropdown-menu li { 
        text-align:center 
    }
    .dropdown .dropdown-menu {
      background-color: #4D5061;
    }
    .dropdown .dropdown-menu a {
      color: white;
    }
    .navbar.navbar-default ul li a {
      display: inline-block;
      padding: 3.5vh 8px 4px;
      color: white;
      text-decoration: none;
      font-size: 14pt;
      font-family: 'Roboto', sans-serif;
    }
    .navbar.navbar-default ul li:after {
      content: '';
      position: absolute;
      right: 50%;
      bottom: 0;
      left: 50%;
      height: 3px;
      background-color: #FFFFFF;
      border-radius: 9px;
      transition: all .2s;
    }
    .navbar.navbar-default ul li a:hover {
      color: white;
    }
    .nav.navbar-nav,
    .nav.navbar-nav>li {
      float: none;
    }
    .navbar.navbar-default ul li:hover:after {
      right: 0;
      left: 0;
    }
    .nav>li>a:hover {
    background-color: rgba(17, 17, 17, 0.2);
    }
    #logo {
      padding-top: 2vh;
      padding-left: 20px;
      float: left;
    }
    nav-title {
        display: block;
        margin: 0 auto; /*auto will do the centering trick*/
        width: 80%; /*or any width*/
        position: relative;
    }
    .hero {
      background-image: url("https://static.pexels.com/photos/48727/pexels-photo-48727.jpeg");
      background-attachment: fixed;
      position:absolute;
      width: 100%;
      width: 100vw;
      height: 100%;
      height: 70vh;
    }
    section {
      position: relative;
      height: 95vh;
    }
    .section1 {
      height: 100vh;
      text-align: center;
      color: white;
    }
    .section2 {
      //height: 95vh;
      background-color: #11B5E4;
      text-align: center;
      color: white;
    }
    .section3 {
      //height: 95vh;
      background-color: #EDF7F6;
      text-align: center;
      color: white;
    }
    .fa-angle-down {
      color: #4D5061;
      position: absolute;
      bottom: 0px;
    }
    .fa-angle-up {
      color: #4D5061;
      position: absolute;
      bottom: 0px;
    }
    .footer {
      height: 5vh;
      background-color: #4D5061;
      text-align: center;
      padding:0;
      right:0;
      bottom:0;
      left:0:
    }
    h1{
      font-size: 14pt;
      margin:0;
      text-align: center;
      color: white;
      font-family: 'Roboto', sans-serif;
    }
    .navbar.navbar-default ul.dropdown-menu li,
    .navbar.navbar-default ul.dropdown-menu li a {
      position: relative;
      display: block;
    }
    </style>

最佳答案

问题 2:没有任何反应的原因是因为默认情况下任何 DIV 高度和宽度都是 0px，所以你必须明确提及高度和宽度。如果您希望主图为 100% 的高度和 100% 的宽度，我建议您在 CSS 中使用 vw(视口(viewport)宽度)和 vh(视口(viewport)高度值)，其中 100vw 表示 100% 的视口(viewport)宽度(高度的逻辑相同)。喜欢这里:

.hero {
  background-image: url("https://static.pexels.com/photos/48727/pexels-photo-48727.jpeg");
  background-attachment: fixed;
  position: fixed;
  width: 100%;
  width: 100vw;
  height: 100%;
  height: 100vh;
}

百分比值是为了向后兼容。

问题 1:将 h1 放在 div 中并将其居中:

<div>
  <h1>Welcome to Liam Docherty's Digital Portfolio</h1>
</div>

CSS:

div{
 display: block;
 margin: 0 auto; /*auto will do the centering trick*/
 width: 80%; /*or any width*/
 position: relative;
}

div 必须在导航容器之外。

关于html - 如何让文本居中以及如何让 <DIV> 成为背景图片？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42808213/

25 4 0
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