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I'm working on a CSS layout, but I don't understand why the background color of my navigation bar doesn't show up unless I add overflow: hidden to the CSS. Can someone explain to me what's going on? Thanks :)
My CSS file:
@import "reset.css"; /* Meyer's CSS reset */
body { background-color: #f3f3f3; font: 15px sans-serif; }
#wrapper {
width: 1000px;
margin: 0 auto;
}
#navigation {
width: inherit;
margin-top: 20px;
background-color: #ccc;
overflow: hidden;
}
#navigation li {
float: left;
}
#navigation li a {
display: block;
padding: 10px 10px;
text-decoration: none;
color: #000;
}
#navigation li a:hover {
background-color: #aaa;
}
My HTML file:
<!DOCTYPE html>
<html>
<head>
<title>Layout</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" type="text/css" href="css/styles.css" />
</head>
<body>
<div id="wrapper">
<div id="navigation">
<ul>
<li><a href="">Nav0</a></li>
<li><a href="">Nav1</a></li>
<li><a href="">Nav2</a></li>
<li><a href="">Nav3</a></li>
<li><a href="">Nav4</a></li>
<li><a href="">Nav5</a></li>
</ul>
</div>
<div id="header">
</div>
<div id="content">
</div>
<div id="footer">
</div>
</div>
</body>
</html>
578
that is because you have set the background color, and then overwritten it by using the background shorthand…. either move the background-color call after the background shorthand, or add it TO the shorthand… the browser interprets your current code like this…
The background-color CSS property sets the background color of an element.
Background-color values can be expressed in hexadecimal values such as #FFFFFF, #000000, and #FF0000. Background-color values can be expressed using rgb such as rgb(255,255,255), rgb(0,0,0), and rgb(255,0,0).
overflow: hidden causes the container to establish a new formatting context within which to contain the floats. Without it, the floated elements form their own formatting contexts and display independently of the container, out of normal flow.
116
You should use a clear fix class (either an empty element after the <ul> or use a clear fix class on the <ul> so the browser will properly clear the floats.
.clearfix {
zoom:1;
}
.clearfix:after {
content: ".";
display: block;
clear: both;
visibility: hidden;
line-height: 0;
height: 0;
}
Is one I use most of the time. Here is a fiddle of it in action: http://jsfiddle.net/gpQ2f/1/
34
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