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我可以在简单的 html/css 中做一些事情，将其设置为黑色背景并在其前面有一个白色居中，如下所示：

<html>
<head>
<style>

body
{
  background-color:#000;
}


#div1
{
  margin-left:auto;
  margin-right:auto;
  width:90%;
  background-color:#eeeeee;
}

#bannerImg
{
  width:100%;
  display:block;
  margin-left:auto;
  margin-right:auto;
}

</style>
</head>
<body>
  <div id="div1">
    <img id="bannerImg" src="brav-banner-3.jpg">
    <p>This is some text.
    <p> And some more.
    <p> And some more.
  </div>
</body>

但是当我在 WordPress 中使用 BlankSlate 主题尝试同样的事情时，我无法显示任何白色。这里是 header.php、front-page.php 和 style.css。

<!DOCTYPE html>
<html <?php language_attributes(); ?>>
   <head>
     ....
   </head>
<body <?php body_class(); ?>>
   <div id="wrapper" class="hfeed">
      <header id="header" role="banner">
         <img src="<?php get_template_directory()?>/assets/img/brav-banner-3.jpg">
         <div id="navDiv"><nav id="menu" role="navigation">
            <?php wp_nav_menu( array( 'theme_location' => 'main-menu' ) ); ?>
         </nav></div>
      </header>
   <div id="container">

前端页面.php：

<?php get_header(); ?>
<section id="content" role="main">
  <div id="info">
       <h4>In the Los Angeles area? </h4> <p>Ask about free demo loaners! </p>
       <h4>We also take mail orders.</h4> On all orders, there is a 30-day return policy!</p> 
  </div>
  <div id="longSlogan">
       <img class="frontpageimg" src="<?php get_template_directory(); ?>/assets/img/slogan-2.jpg">

  </div>
</section>
<?php get_sidebar(); ?>
<?php get_footer(); ?>

样式.css：

#header {
  margin-left: auto;
  margin-right: auto;
  width:90%;
}

body {
  background: #000;
}

#longSlogan {
  margin-left: 20px;
}

#container {
  clear:both;
  backgroud-color:#fff;
}

nav {
  display:block;
  overflow:hidden;
  width: 100%;
  background-color: #222222;
}
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