html - 无法弄清楚为什么我的 css 的一部分没有正确显示

Question

我正在搭建一个网站，并一直在我的 CSS 中使用“背景颜色”标签来调试每个 block (部分)所在的位置。我的“#mainContent”部分遇到了一点问题，无法弄清楚为什么没有显示背景色(用于调试)。

这是整个页面代码的 JSFIDDLE 链接:http://jsfiddle.net/JGAd6/

这是与该部分关联的代码:

-- HTML--

<div id="mainContentWrapper">

    <div id="mainContent">

        <div id="services">

            <div class="serviceNavLink"><a href="#">Marketing Strategy</a>
                <p>Qui tonx helvetica master cleanse, odd future cupidatat raw 
                denim fugiat et intelligentsia quis semiotics quinoa. Gentrify pork belly consequat synth. Portland ethical salvia, ex sunt mustache flexitarian art party wayfarers. Tousled ennui scenester, nostrud brunch banjo raw denim pug pour-over. Nesciunt synth mlkshk keytar, skateboard fashion axe reprehenderit umami pug bespoke.</p>
            </div>
            <div class="serviceNavLink"><a href="#">Outsourced Marketing</a>
                <p>Qui tonx helvetica master cleanse, odd future cupidatat raw denim 
                fugiat et intelligentsia quis semiotics quinoa. Gentrify pork belly consequat synth. Portland ethical salvia, ex sunt mustache flexitarian art party wayfarers. Tousled ennui scenester, nostrud brunch banjo raw denim pug pour-over. Nesciunt synth mlkshk keytar, skateboard fashion axe reprehenderit umami pug bespoke.</p>
            </div>
            <div class="serviceNavLink"><a href="#">Market Research</a>
                <p>Qui tonx helvetica master cleanse, odd future cupidatat raw 
                denim fugiat et intelligentsia quis semiotics quinoa. Gentrify pork belly consequat synth. Portland ethical salvia, ex sunt mustache flexitarian art party wayfarers. Tousled ennui scenester, nostrud brunch banjo raw denim pug pour-over. Nesciunt synth mlkshk keytar, skateboard fashion axe reprehenderit umami pug bespoke.</p>          
            </div>

        </div>

    </div>  

</div>

-- CSS--

#headerWrapper, #topContentWrapper, #mainContentWrapper, #footerWrapper {
width:100%;
clear:both;
}

#headerContent, #topContent, #mainContent, #footerContent {
width:955px;
margin-left: auto;
margin-right: auto;

padding-right: 1em;
padding-left: 1em;
}


#mainContentWrapper {
border:1px solid #000; /* DEBUG ONLY */
background-color: #61e9a1; /* DEBUG ONLY */
}

#mainContent {
font-size: 1.2em;
background-color:ff0000; /* DEBUG ONLY */
line-height: 1.6em;

padding-top: 1em;
padding-bottom: 1em;
}

#services a:hover {
color: #000;
}

#services p {
width:200px;
font-size: 14px;
}

Answer 1

如果您指的是红色背景未出现，您需要将 CSS 更改为:

#mainContent {
font-size: 1.2em;
background-color:#ff0000; /* DEBUG ONLY */
line-height: 1.6em;
overflow:auto;
padding-top: 1em;
padding-bottom: 1em;
}

jsFiddle example

我添加了一个 overflow:auto 规则并为您的背景颜色声明插入了一个缺失的 #。