引导导航栏上方的徽标

Question

您好，我正在尝试在引导导航栏上方放置一个徽标：

https://jsfiddle.net/3jod2k8z/1/

<div>

<div id="logo"><img src="http://www.benchmarklearning.co.uk/photo/logo.jpg" class="img-responsive" alt="bmlogo"> </div>

<div class="container-fluid">



<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header"> 
  <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">

    <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="logotest.png">Benchmark</a>


   </div> 

<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse">
  <ul class="nav navbar-nav">


      <!-- class="active"-->
    <li><a href="#a">About</a></li>
    <li><a href="#b">Who we are</a></li>
    <li><a href="#c">Latest Publications</a></li>
    <li><a href="#d">Online Center</a></li>
    <li><a href="#e">Our Partners</a></li>
    <li><a href="#f">English My Way</a></li>
    <li><a href="#g">Apprenticeship</a></li>
    <li><a href="#h">IT Academy</a></li>
    <li><a href="languagesense.html">Learning Sense</a></li>
  </ul>
</div><!-- /.navbar-collapse -->

您可以看到图像是微型的，我似乎无法修复它，还有没有办法无论屏幕尺寸如何都可以居中对齐？

谢谢

Answer 1

样式名称[标志]编辑，

#logo{
    padding-top:10px;
    width:100%;
}

到

#logo img{
    padding-top:10px;
    width:100%;
}

https://jsfiddle.net/3jod2k8z/6/

Answer 2

当我意识到你想居中对齐（水平？）它所以它的宽度不会（总是）是 100%？ 如果是这种情况，这应该可以解决问题：

#logo img{
  display:block;
  margin: 0 auto;
  height:200px;
  width:auto;
}

这里是fiddle

Answer 3

将显示设置为block 并使用边距使图像居中。然后，您可以使用媒体查询使其在较小的视口上保持响应。您可能还想将#logo div 的背景颜色设置为白色，因为您的图像没有透明背景，如果您在主体上设置了背景会看起来很奇怪。

查看工作示例片段。

html,
body {
  background: lightblue;
}
.navbar.navbar-default {
  background-color: #132D93;
  /* Old browsers */
  background-image: -moz-linear-gradient(left, #0000CD 32%, #4169E1 50%, #0000CD 68%);
  /* FF3.6+ */
  background-image: -webkit-gradient(linear, left top, right top, color-stop(32%, #0000CD), color-stop(50%, #4169E1), color-stop(68%, #0000CD));
  /* Chrome,Safari4+ */
  background-image: -webkit-linear-gradient(left, #0000CD 32%, #4169E1 50%, #0000CD 68%);
  /* Chrome10+,Safari5.1+ */
  background-image: -o-linear-gradient(left, #0000CD 32%, #4169E1 50%, #0000CD 68%);
  /* Opera 11.10+ */
  background-image: -ms-linear-gradient(left, #0000CD 32%, #4169E1 50%, #0000CD 68%);
  /* IE10+ */
  background-image: linear-gradient(to right, #0000CD 32%, #4169E1 50%, #0000CD 68%);
  /* W3C */
  filter: progid: DXImageTransform.Microsoft.gradient(startColorstr='#0000CD', endColorstr='#0000CD', GradientType=1);
  /* IE6-9 */
  border-bottom: 6px solid #B9975B;
  margin-bottom: 0px;
}
#logo {
  width: 100%;
  background: white;
}
#logo img {
  display: block;
  margin: 0 auto;
  height: 150px;
  padding: 10px;
}
.navbar.navbar-default ul li a {
  color: white;
  text-transform: uppercase;
  font-size: 13px;
  padding: 20px 10px;
  font-weight: bold;
}
.navbar.navbar-default .navbar-header a {
  color: white;
  text-transform: uppercase;
  font-size: 13px;
  padding: 20px 10px;
  font-weight: bold;
}
.navbar.navbar-default .navbar-brand {
  color: white;
  margin-top: -6px;
}
.navbar.navbar-default .navbar-brand img {
  margin-left: 23px;
  width: 40px;
}
.navbar.navbar-default .navbar-nav > .active > a,
.navbar.navbar-default .navbar-nav > .active > a:hover,
.navbar.navbar-default .navbar-nav > .active > a:focus {
  color: #000;
  background: #B9975B;
  font-weight: bold;
}
.navbar.navbar-default .active {
  color: #000;
  background: #B9975B;
  font-weight: bold;
}
.navbar.navbar-default .navbar-collapse {
  max-height: 300px;
}
.navbar.navbar-default .navbar-collapse li {
  font-size: 10px;
}
.navbar.navbar-default #a {
  color: red;
}
.navbar.navbar-default #b {
  color: green;
}
.navbar.navbar-default #c {
  color: blue;
}
.navbar.navbar-default .icon-bar {
  background-color: #B9975B;
}
.navbar.navbar-default .navbar-toggle {
  border: 2px solid #B9975B;
}
@media (max-width: 767px) {
  #logo img {
    height: 125px;
  }
  .navbar.navbar-default .navbar-brand {
    margin-top: -10px;
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" />
<div id="logo">
  <img src="http://www.benchmarklearning.co.uk/photo/logo.jpg" alt="bmlogo">
</div>
<nav class="navbar navbar-default" id="topnavbar">
  <div class="container-fluid">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse"> <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://www.benchmarklearning.co.uk/photo/logo.jpg">Benchmark</a>
    </div>

    <div class="collapse navbar-collapse">
      <ul class="nav navbar-nav">

        <li><a href="#a">About</a>
        </li>
        <li><a href="#b">Who we are</a>
        </li>
        <li><a href="#c">Latest Publications</a>
        </li>
        <li><a href="#d">Online Center</a>
        </li>
        <li><a href="#e">Our Partners</a>
        </li>
        <li><a href="#f">English My Way</a>
        </li>
        <li><a href="#g">Apprenticeship</a>
        </li>
        <li><a href="#h">IT Academy</a>
        </li>
        <li><a href="languagesense.html">Learning Sense</a>
        </li>
      </ul>
    </div>
  </div>
</nav>