如何使用背景图像后面的引导程序在中心上方放置<div>？

时间：2017-03-31 23:40:10

标签： html css twitter-bootstrap

我试图将我的照片<div class="shape">放在使用引导程序在中心上方的<div class="hero">背景图像的顶部。

然而，背景颜色和图像都出现在我的照片上方。我正在寻找背景图片，以便在我的照片背后，以及此时此刻不能看到的背景颜色。

如果您决定帮助我，请不要删除背景颜色，因为我想在稍后阶段使用它。

请全屏打开代码段以查看我的问题。

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<style>
      .body {
      font-family: 'Roboto', sans-serif;
      color: black;
      }
      .navbar.navbar-default {
      background-color: #FFFFFF;
      height: 10vh;
      z-index: 100;
      }
      .navbar.navbar-default ul {
      list-style-type: none;
      text-align: center;
      }
      .navbar.navbar-default ul li {
      display: inline-block;
      }
      .dropdown-menu li {
      text-align: center;
      }
      .dropdown .dropdown-menu {
      background-color: #FFFFFF;
      }
      .dropdown .dropdown-menu a {
      color: white;
      }
      .navbar.navbar-default ul li a {
      display: inline-block;
      padding: 3.5vh 8px 4px;
      color: black;
      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: black;
      border-radius: 9px;
      transition: all .2s;
      }
      .nav.navbar-nav,
      .nav.navbar-nav>li {
      float: none;
      }
      .navbar.navbar-default ul li:hover:after {
      right: 0;
      left: 0;
      }
      .navbar.navbar-default ul.dropdown-menu li,
      .navbar.navbar-default ul.dropdown-menu li a {
      position: relative;
      display: block;
      }
      .section {
      min-height: 100vh;
      }
      .one {
      background-color:#c00;
      }
      .two {
      background: #563D7C;
      }
      #sections .section {
      padding-top: ~50px;
      }
      .hero {
      background: url("http://mowebusa.nobletechindia.com/wp-content/uploads/2016/05/computer.jpg") center center no-repeat;
      background-attachment: fixed;
      position: relative;
      background-size: cover;
      width: 100%;
      max-width: 100%;
      width: 100vw;
      height: 100%;
      }
      .shape {
      border-radius: 25px;
      background: #4D5061;
      content: url(http://i1126.photobucket.com/albums/l611/ldocherty1/IMG_0730_zpsiz4dqc47.jpg);
      color: white;
      height: 300px;
      margin: auto;
      padding: 3px;
      width: 300px;
      margin-left: auto;
      margin-right: auto;
      }
   </style>
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!DOCTYPE html>
<html lang="en">
   <head>
      <meta name="viewport" content="width=device-width, initial-scale=1">
      <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
      <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>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/fullPage.js/2.9.4/jquery.fullpage.min.js"></script>
   </head>
   
   <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>
            </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>
      <div id="sections">
         <div class="section one">
            <div class="shape"></div>
            <div class="hero"></div>
            <a href="#section two"> <i class="fa fa-angle-down" style="font-size:100px;"></i></a>
         </div>
         <div class="section two"></div>
            <a href="#section one"> <i class="fa fa-angle-up" style="font-size:100px;"></i></a>
      </div>
      <script>
         $(document).ready(function() {
           $('#sections').fullpage();
         });
      </script>
   </body>
</html>
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1 个答案:

答案 0 :(得分：0)

您可以按照以下步骤执行此操作：

  1. 将position: absolute添加到.shape以重叠英雄图片。
  2. 在z-index: 10 image
    3. 之上添加.shape以获取.hero

    现在，要居中对齐定位元素，请记住以下技巧：

    1. 使用left: 50%将定位元素从左侧放置50％。
    2. 添加margin-left: -150px

      3. 如果元素的宽度为1px（.shape将在左起50％后开始），那么第一步就可以正常工作了，但由于它的宽度为300px，所以必须添加一个负余量 - 左边等于元素宽度的一半（300/2 = 150）。

      同样，对于垂直对齐，您可以使用top: 50%和负margin-top等于height的1/2。

      注意： padding-top: ~50px;出现问题，删除~，因为它是无效令牌。此外，填充不能为负。

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      .body {
  font-family: 'Roboto', sans-serif;
  color: black;
}

.navbar.navbar-default {
  background-color: #FFFFFF;
  height: 10vh;
  z-index: 100;
}

.navbar.navbar-default ul {
  list-style-type: none;
  text-align: center;
}

.navbar.navbar-default ul li {
  display: inline-block;
}

.dropdown-menu li {
  text-align: center;
}

.dropdown .dropdown-menu {
  background-color: #FFFFFF;
}

.dropdown .dropdown-menu a {
  color: white;
}

.navbar.navbar-default ul li a {
  display: inline-block;
  padding: 3.5vh 8px 4px;
  color: black;
  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: black;
  border-radius: 9px;
  transition: all .2s;
}

.nav.navbar-nav,
.nav.navbar-nav>li {
  float: none;
}

.navbar.navbar-default ul li:hover:after {
  right: 0;
  left: 0;
}

.navbar.navbar-default ul.dropdown-menu li,
.navbar.navbar-default ul.dropdown-menu li a {
  position: relative;
  display: block;
}

.section {
  min-height: 100vh;
}

.one {
  background-color: #c00;
}

.two {
  background: #563D7C;
}

#sections .section {
  padding-top: 50px;
}

.hero {
  background: url("http://mowebusa.nobletechindia.com/wp-content/uploads/2016/05/computer.jpg") center center no-repeat;
  background-attachment: fixed;
  position: relative;
  background-size: cover;
  width: 100%;
  max-width: 100%;
  width: 100vw;
  height: 100%;
}

.shape {
  border-radius: 25px;
  background: #4D5061;
  content: url(http://i1126.photobucket.com/albums/l611/ldocherty1/IMG_0730_zpsiz4dqc47.jpg);
  color: white;
  height: 300px;
  margin: auto;
  padding: 3px;
  width: 300px;

  /* add this */
  position: absolute;
  left: 50%;
  margin-left: -150px;
  z-index: 10;
}
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      !DOCTYPE html>
<html lang="en">

<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <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>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/fullPage.js/2.9.4/jquery.fullpage.min.js"></script>
</head>

<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>
      </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>
  <div id="sections">
    <div class="section one">

      <div class="shape"></div>
      <div class="hero"></div>
      <a href="#section two"> <i class="fa fa-angle-down" style="font-size:100px;"></i></a>
    </div>
    <div class="section two"></div>
    <a href="#section one"> <i class="fa fa-angle-up" style="font-size:100px;"></i></a>
  </div>
  <script>
    $(document).ready(function() {
      $('#sections').fullpage();
    });
  </script>
</body>

</html>
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