【发布时间】：2016-07-14 23:28:33
【问题描述】：
/* Don't erase box-sizing */
*{
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
-box-sizing: border-box;
}
/* Don't erase .group */
.group:after {
content: "";
display: table;
clear: both;
}
body {
background: #cccccc;
font-family: Helvetica, Arial, Sans-serif;
line-height: 1.5em;
font-size: 14px;
color: #666666;
margin: 0;
}
a{
color: #f58220;
}
#main_wrapper{
width: 960px;
margin: 0 auto;
}
header {
background: #333333;
padding: 30px 0 0 0;
}
.logo a{
display: block;
width: 133px;
height: 46px;
background: url(http://www.teamusa.org/~/media/USA_Fencing/Logo/Nike-Fencing.png?la=en);
background-repeat: no-repeat;
background-size: 100% 100%;
text-indent: -9999px;
margin: 0 0 25px 20px;
}
.primary ul {
background: #666666;
}
.primary ul li {
float: left;
border-right: 1px solid #333333;
}
.primary ul li a {
display: block;
padding: 20px;
color: #ffffff;
}
.content_wrap {
background: e5e5e5;
}
#main_content {
background: #ffffff;
float: left;
width: 660px;
}
aside {
width: 300px;
background: #e5e5e5;
float: right;
}
footer {
clear: both;
background: #333333;
height: 50px;
}
/* http://meyerweb.com/eric/tools/css/reset/
v2.0 | 20110126
License: none (public domain)
*/
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
margin: 0;
padding: 0;
border: 0;
font-size: 100%;
font: inherit;
vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
display: block;
}
body {
line-height: 1;
}
ol, ul {
list-style: none;
}
blockquote, q {
quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
content: '';
content: none;
}
table {
border-collapse: collapse;
border-spacing: 0;
}<!DOCTYPE HTML}>
<html>
<head>
<title>Yonsei Fencing</title>
<link rel="stylesheet" href="reset.css" type="text/css"/>
<link rel="stylesheet" href="index5.css" type="text/css"/>
</head>
<body>
<div id="main_wrapper">
<header>
<h1 class="logo"><a href="#" title="cool image">This is an image</a></h1>
<nav class="primary">
<ul class="group">
<li><a href="#">Link</a></li>
<li><a href="#">Link</a></li>
<li><a href="#">Link</a></li>
<li><a href="#">Link</a></li>
<li><a href="#">Link</a></li>
</ul>
</nav>
</header><!--end header-->
<div class="content_wrap" group>
<section id="main_content">
<article class="posts"><img class="thumbnail" src="#" alt="thumbnail">
<div>
<h1><a href="#" title="">This is a Lorem Ipsum Heading</a></h1>
<p>"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."</p>
<a href="#" title="readmore">Read More</a>
</div>
</article>
<article class="posts"><img class="thumbnail" src="#" alt="thumbnail">
<div>
<h1><a href="#" title="">This is a Lorem Ipsum Heading</a></h1>
<p>"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."</p>
<a href="#" title="readmore">Read More</a>
</div>
</article>
<article class="posts"><img class="thumbnail" src="#" alt="thumbnail">
<div>
<h1><a href="#" title="">This is a Lorem Ipsum Heading</a></h1>
<p>"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."</p>
<a href="#" title="readmore">Read More</a>
</div>
</article>
<article class="posts"><img class="thumbnail" src="#" alt="thumbnail">
<div>
<h1><a href="#" title="">This is a Lorem Ipsum Heading</a></h1>
<p>"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."</p>
<a href="#" title="readmore">Read More</a>
</div>
</article>
<article class="posts"><img class="thumbnail" src="#" alt="thumbnail">
<div>
<h1><a href="#" title="">This is a Lorem Ipsum Heading</a></h1>
<p>"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."</p>
<a href="#" title="readmore">Read More</a>
</div>
</article>
</section><!--end main_content-->
<aside>
<div class="side_box">
<h2 class="sidebar_heading">Sidebar Links</h2>
<ul>
<li><a href="#" title="">Link 1</a></li>
<li><a href="#" title="">Link 2</a></li>
<li><a href="#" title="">Link 3</a></li>
<li><a href="#" title="">Link 4</a></li>
</ul>
</div><!--end sidebox-->
<div class="side_box">
<h2 class="sidebar_heading">Text Widget</h2>
<p>"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. </br></br>Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."</p>
</div><!--end sidebox-->
</aside><!--end sidebar-->
</div><!--end content wrap-->
<footer>
<small>Copyright <a href="#">WebSite.</a> All rights reserved.</small>
</footer>
</div>
</body>
</html>你好，这里是初学者。
我在单独的样式表上的 CSS 重置 (http://meyerweb.com/eric/tools/css/reset/)（我在此处合并了两个 CSS 样式表）似乎通过禁用徽标周围标题上的黑色背景颜色来干扰我的主样式表。正文中的字体大小和行高也不会改变。此外，“.group:after”(https://css-tricks.com/snippets/css/clear-fix/) 应该填补我侧边栏中缺少的背景颜色空白，但仍然有一个空白空间......
帮助？
【问题讨论】：