带有 twitter 引导程序的全身背景图像

Question

我正在尝试使用 twitter bootstrap 实现全身背景图像，但它不工作我正在检查全屏模式它在移动和平板电脑模式下工作。

这是html

    <div id="header">

  <nav class="navbar navbar-inverse navbar-fixed-top">
      <div class="container">
        <div class="navbar-header">
          <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
            <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="#">Hifzil</a>
        </div>
        <div id="navbar" class="collapse navbar-collapse">
          <ul class="nav navbar-nav">
            <li class="active"><a href="#">Home</a></li>
            <li><a href="#about">Spelling Test</a></li>
            <li><a href="#contact">Practise Writing</a></li>
           <li><a href="#about">Spelling Game</a></li>
            <li><a href="#contact">English Dictionary</a></li>
               <li><a href="#about">Games</a></li>
            <li><a href="#contact">Support</a></li>

         </ul>
              <ul class="nav navbar-nav navbar-right">
      <li><a href="#"><span class="glyphicon glyphicon-user"></span> Sign Up</a></li>
      <li><a href="#"><span class="glyphicon glyphicon-log-in"></span> Login</a></li>
    </ul>
        </div><!--/.nav-collapse -->
      </div>
    </nav>

        <div id="boundry">
        <div class="searchbutton">  <a href="dic.php">Click Here To Start E-learning Drive !</a></div>      

            </div>
            </div>


<div class="col-md-9 text-center col-centered">
<div class="grade-module intro1">  <a href="#" class="gradeStyle blue1-bg">English</a> <div class="bd-grade blue1-bdr">
            <p class="text">Counting objects, fewer and more, names of colors, inside and outside, longer and shorter, and more.</p>
        </div>
        </div>
        <div class="grade-module intro2">
          <a href="dic.php" class="gradeStyle orange1-bg">Dictionary</a> <div class="bd-grade orange-bdr"><p class="text">Learn New Words From Dictionary And Their Meanings,Parts Of Speeches And Their Visualization</p></div>
         </div>
         <div class="grade-module intro3">
          <a href="paint.php" class="gradeStyle green-bg">Speeling Practice</a> <div class="bd-grade green-bdr"><p class="text">Practice Speelings By Drawing The Words . All you have to paint inside the letter not outside</p></div>
         </div>
         <div class="grade-module intro4">
          <a href="#" class="gradeStyle red-bg">Quiz</a> <div class="bd-grade red-bdr"><p class="text">Speeling quiz can provide you the opportunity to revise whether you have correctly memorize or not </p></div>
         </div>
         <div class="grade-module intro5">
          <a href="#" class="gradeStyle light-bg">Games</a> <div class="bd-grade light-bdr"><p class="text">Learning by increasing vocubulary from playing games like words search , scrabble and letterrace .</p></div>
         </div>
           <div class="grade-module intro6">
          <a href="#" class="gradeStyle voilet-bg">Visualization</a> <div class="bd-grade voilet-bdr"><p class="text">Visualization of words tends to lead towards learning and memorizing the words , their description and meaning</p></div>
         </div>
</div>

这是css

#header{
    background: url('..images/english.jpg') no-repeat center top;
    padding-top: 200px;
    text-align: center;
    background-attachment: relative;
    background-position: center center;
    min-height: 670px;
    width: 100%;
    -webkit-background-size: 100%;
    -moz-background-size: 100%;
    -o-background-size: 100%;
    background-size: 100%;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;

}

Answer 1

使用position: absolute;，您可以做到。

使用上边距：100vh；我认为在第二个 div 中包含获得所需内容的内容：

#content { margin-top: 100vh}

Updated fiddle

Answer 2

你可以这样做。

旁注，由于 bkg 定位，body 的其他直接子级也需要，否则它们会出现在下方，因此添加了 body > * { position: relative; } 规则。

html, body {
  margin: 0;
}
body > * {
  position: relative;
}
#bkg {
  position: fixed;      /*  or use absolute if it should scroll with content  */
  left: 0; top: 0;
  right: 0; bottom: 0;
  background: url('http://lorempicsum.com/futurama/627/200/3') no-repeat center center;
  background-size: cover;
  opacity: 0.3;         /*  temp. added to make text appear better   */
}

<div id="bkg"></div>

<div id="header">

  <nav class="navbar navbar-inverse navbar-fixed-top">
    <div class="container">
      <div class="navbar-header">
        <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
          <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="#">Hifzil</a>
      </div>
      <div id="navbar" class="collapse navbar-collapse">
        <ul class="nav navbar-nav">
          <li class="active"><a href="#">Home</a></li>
          <li><a href="#about">Spelling Test</a></li>
          <li><a href="#contact">Practise Writing</a></li>
          <li><a href="#about">Spelling Game</a></li>
          <li><a href="#contact">English Dictionary</a></li>
          <li><a href="#about">Games</a></li>
          <li><a href="#contact">Support</a></li>

        </ul>
        <ul class="nav navbar-nav navbar-right">
          <li><a href="#"><span class="glyphicon glyphicon-user"></span> Sign Up</a></li>
          <li><a href="#"><span class="glyphicon glyphicon-log-in"></span> Login</a></li>
        </ul>
      </div><!--/.nav-collapse -->
    </div>
  </nav>

  <div id="boundry">
    <div class="searchbutton">  <a href="dic.php">Click Here To Start E-learning Drive !</a></div>      

  </div>
</div>


<div class="col-md-9 text-center col-centered">
  <div class="grade-module intro1">  <a href="#" class="gradeStyle blue1-bg">English</a> <div class="bd-grade blue1-bdr">
    <p class="text">Counting objects, fewer and more, names of colors, inside and outside, longer and shorter, and more.</p>
    </div>
  </div>
  <div class="grade-module intro2">
    <a href="dic.php" class="gradeStyle orange1-bg">Dictionary</a> <div class="bd-grade orange-bdr"><p class="text">Learn New Words From Dictionary And Their Meanings,Parts Of Speeches And Their Visualization</p></div>
  </div>
  <div class="grade-module intro3">
    <a href="paint.php" class="gradeStyle green-bg">Speeling Practice</a> <div class="bd-grade green-bdr"><p class="text">Practice Speelings By Drawing The Words . All you have to paint inside the letter not outside</p></div>
  </div>
  <div class="grade-module intro4">
    <a href="#" class="gradeStyle red-bg">Quiz</a> <div class="bd-grade red-bdr"><p class="text">Speeling quiz can provide you the opportunity to revise whether you have correctly memorize or not </p></div>
  </div>
  <div class="grade-module intro5">
    <a href="#" class="gradeStyle light-bg">Games</a> <div class="bd-grade light-bdr"><p class="text">Learning by increasing vocubulary from playing games like words search , scrabble and letterrace .</p></div>
  </div>
  <div class="grade-module intro6">
    <a href="#" class="gradeStyle voilet-bg">Visualization</a> <div class="bd-grade voilet-bdr"><p class="text">Visualization of words tends to lead towards learning and memorizing the words , their description and meaning</p></div>
  </div>
</div>