html - 我无法在 css 中自定义图片的大小。

Question

我试图使图片 100%，但它不起作用。

代码:

html:

<nav class="navbar navbar-default navbar-fixed-top" role="navigation">
    <div class="container">
        <div class="navbar-header page-scroll">
            <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-ex1-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 page-scroll" href="#page-top">Start Bootstrap</a>
        </div>

        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse navbar-ex1-collapse">
            <ul class="nav navbar-nav navbar-right">
                <!-- Hidden li included to remove active class from about link when scrolled up past about section -->
                <li class="hidden">
                    <a class="page-scroll" href="#page-top"></a>
                </li>
                <li>
                    <a class="page-scroll" href="#about">About</a>
                </li>
                <li>
                    <a class="page-scroll" href="#services">Services</a>
                </li>
                <li>
                    <a class="page-scroll" href="#contact">Contact</a>
                </li>
            </ul>
        </div>
        <!-- /.navbar-collapse -->
    </div>
    <!-- /.container -->
</nav>

<!-- Intro Section -->
<div class="headerimg"
     ><img src="pix/stockvault-city-skyline-at-sunset-113039.jpg">
</div>
<section id="intro" class="intro-section">
    <div class="container">
        <a href="#about" class="page-scroll btn btn-xl">Tell Me More</a>
    </div>
</section>

CSS:

.headerimg {
width: 50%;
height: 100px; }

如果有人能提供帮助，那将非常有帮助。我通常能够做到，但由于某种原因我这次无法做到。再次感谢你的帮助。

Answer 1

只需将 CSS 更改为:

    .headerimg
    {
     width: 50%;
     height: 100px; 
    }

  img {
     width: 100%;
   }    

它将使图像的宽度 100%。

看这个:http://jsfiddle.net/cadh3vv9/