浏览器缩小后，轮播图片上得字不缩小

如题……感觉代码没错啊

<div id="myCarousel" class="carousel slide" data-ride="carousel">
    <!-- 轮播（Carousel）指标 -->
    <ol class="carousel-indicators">
        <li data-target="#myCarousel" data-slide-to="0" class="active"></li>
        <li data-target="#myCarousel" data-slide-to="1"></li>
        <li data-target="#myCarousel" data-slide-to="2"></li>
        <li data-target="#myCarousel" data-slide-to="3"></li>
        <li data-target="#myCarousel" data-slide-to="4"></li>
    </ol>
    <!-- 轮播（Carousel）项目 -->
    <div class="carousel-inner">
        <div class="item active">
            <img src="images/chrome-big.jpg" alt="Chrome">
            <div class="container">
                <div class="carousel-caption">
                    <h1>Chrome</h1>

                    <p>Google Chrome，又称Google浏览器，是一个由Google（谷歌）公司开发的网页浏览器。</p>

                    <p><a class="btn btn-lg btn-primary" href="http://www.google.cn/intl/zh-CN/chrome/browser/"
                          role="button" target="_blank">点我下载</a></p>
                </div>
            </div>
        </div>
        <div class="item">
            <img src="images/firefox-big.jpg" alt="FireFox">
            <div class="container">
                <div class="carousel-caption">
                    <h1>Firefox</h1>

                    <p>Mozilla Firefox，中文名通常称为“火狐”或“火狐浏览器”，是一个开源网页浏览器。</p>

                    <p><a class="btn btn-lg btn-primary" href="http://www.firefox.com.cn/download/" target="_blank"
                          role="button">点我下载</a></p>
                </div>
            </div>
        </div>
        <div class="item">
            <img src="images/opera-big.jpg" alt="Opera">
            <div class="container">
                <div class="carousel-caption">
                    <h1>Opera</h1>

                    <p>Opera浏览器，是一款挪威Opera Software ASA公司制作的支持多页面标签式浏览的网络浏览器。</p>

                    <p><a class="btn btn-lg btn-primary" href="http://www.opera.com/zh-cn" target="_blank"
                          role="button">点我下载</a></p>
                </div>
            </div>
        </div>
        <div class="item">
            <img src="images/safari-big.jpg" alt="Safari">
            <div class="container">
                <div class="carousel-caption">
                    <h1>Safari</h1>

                    <p>Safari，是苹果计算机的最新操作系统Mac OS X中的浏览器。</p>

                    <p><a class="btn btn-lg btn-primary" href="http://www.apple.com/cn/safari/" target="_blank"
                          role="button">点我下载</a></p>
                </div>
            </div>
        </div>
        <div class="item">
            <img src="images/ie-big.jpg" alt="IE">
            <div class="container">
                <div class="carousel-caption">
                    <h1>IE</h1>

                    <p>Internet Explorer，简称 IE，是微软公司推出的一款网页浏览器。</p>

                    <p><a class="btn btn-lg btn-primary" href="http://ie.microsoft.com/" target="_blank"
                          role="button">点我下载</a></p>
                </div>
            </div>
        </div>
    </div>
    <!-- 轮播（Carousel）导航 -->
    <a class="left carousel-control" href="#myCarousel" data-slide="prev"><span
            class="glyphicon glyphicon-chevron-left"></span></a>
    <a class="right carousel-control" href="#myCarousel" data-slide="next"><span
            class="glyphicon glyphicon-chevron-right"></span></a>
</div>