Question

/* 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，初学编码员在这里。

我的CSS重置（http://meyerweb.com/eric/tools/css/reset/）在一个单独的样式表上（我在这里结合了两个CSS样式表）似乎通过在我的徽标周围禁用标题上的黑色背景颜色来干扰我的主样式表。正文中的font-size和line-height也不会改变。此外，“。group：after”（https://css-tricks.com/snippets/css/clear-fix/）应该填补我的侧边栏中缺少的背景色差，但仍有空白空间......

帮助？

Answer 1

background选择器中的header属性后面缺少分号。

CSS重置干扰主CSS样式表，并且clearfix不起作用

1 个答案: