Html 位置绝对值和保证金：自动
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Position absolute and margin: auto
提问by Yoshi Peters
I've got a small problem, I want my footer to stay at the bottom of the screen with position: absolute. But my margin: autoto put it in the middle of the screen isn't working anymore.
我有一个小问题，我希望我的页脚用position: absolute. 但是我margin: auto把它放在屏幕中间不再起作用了。
html:
html：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv='Content-Type' content='Type=text/html; charset=utf-8'>
<link rel="shortcut icon" href="../IMAGES/favicon.ico">
<title>TEST</title>
<link href='http://fonts.googleapis.com/css?family=Source+Sans+Pro' rel='stylesheet' type='text/css'>
<link rel="stylesheet" href="../css/stylesheet.css">
</head>
<body>
<div id="header">
<div id="logo">
<img src="../IMAGES/logo.png" />
</div>
<div id="logotitel">
Den Allerstrafste "Ful-Ambi" Live-Band van groot Antwerpen en omstreken!
</div>
</div>
<div id="nav">
<div id="links">
<a href="index.php"><div class="link">Home</div></a>
<a href="wie.php"><div class="link">Wie is wie</div></a>
<a href="fotos.php"><div class="link">Foto's</div></a>
<a href="reperttheitroade.php"><div class="link">Reperttheitroade</div></a>
<a href="links.php"><div class="link">Links</div></a>
<a href="contact.php"><div class="link">Contact</div></a>
</div>
</div>
<div class="clear"></div>
<div id="content">
TEST
</div>
<div class="clear"></div>
<div id="footer">
<div id="copy">
Developed by Yoshi © vAntstAd
</div>
</div>
</body>
</html>
CSS:
CSS：
/* PAGE LAYOUT */
html
{
padding: 0px;
margin: 0px;
}
body
{
background-image: url(../IMAGES/background.png);
padding: 0px;
margin: 0px;
color: white;
font-family: 'Source Sans Pro', serif, sans-serif;
}
.clear
{
clear: both;
}
/* HEADER */
#header
{
width: 1100px;
height: 150px;
background-color: #282828;
margin: auto;
border-bottom: solid;
border-color: red;
}
#logo
{
width: 283px;
height: 100px;
margin: auto;
}
#logotitel
{
width: 1100px;
height: 50px;
line-height: 50px;
text-align: center;
font-size: x-large;
}
/* NAV */
#nav
{
width: 1100px;
height: 50px;
margin-top: 25px;
margin-right: auto;
margin-left: auto;
margin-bottom: 25px;
background-color: red;
}
#links
{
width: 600px;
height: 50px;
margin: auto;
}
.link
{
width: 100px;
height: 50px;
line-height: 50px;
float: left;
text-align: center;
color: white;
text-decoration: none;
}
.link:hover
{
color: #282828;
text-decoration: underline;
}
/* CONTENT */
#content
{
width: 1100px;
height: auto;
margin: auto;
color: #282828;
position: relative;
}
/* FOOTER */
#footer
{
width: 1100PX;
height: 50px;
position: absolute;
bottom: 0;
margin: auto;
background-color: #282828;
}
#copy
{
width: auto;
float: right;
margin-right: 5px;
height: 50px;
line-height: 50px;
}
回答by Jace
Since you know the width of the footer (1100px), you can just do a left:50%;margin-left:-550pxto center it.
由于您知道页脚的宽度 (1100px)，因此您只需执行 aleft:50%;margin-left:-550px即可将其居中。
Example: Centering an absolutely positioned element
http://jsfiddle.net/vdWQG/
示例：居中绝对定位元素
http://jsfiddle.net/vdWQG/
Therefore, footer would become:
因此，页脚将变为：
#footer
{
width: 1100PX;
height: 50px;
position: absolute;
bottom: 0;
left:50%; /* Add this */
margin-left:-550px; /* Add this (this is half of #footers width) */
background-color: #282828;
}
If you want the element to stick on the bottom of the page as the user scrolls down, use position: fixedinstead of position:absolute
如果您希望元素在用户向下滚动时停留在页面底部，请使用position: fixed代替position:absolute
回答by Gust van de Wal
To have a footer at the bottom, centered horizontally, you can apply the following CSS:
要在底部有一个页脚，水平居中，您可以应用以下 CSS：
footer{
width: 100%;
max-width: 600px;
position: fixed;
left: 0;
right: 0;
bottom: 0;
margin: 0 auto;
}
This will center the fixed element, but will also keep it responsive, as it will shrink when the browser has become less wide than the footer.
这将使固定元素居中，但也将保持响应，因为当浏览器变得比页脚更窄时，它会缩小。
See this Fiddlefor an example
参见这个Fiddle的例子
