Position footer at bottom of page having fixed header

I want to position the footer at the bottom of the page which having a fixed header also...

Not with position: fixed - I don't want it to remain on the screen, it should just be at the end of the page and behave normally when scrolling.
Not at the bottom of the visible screen - At the bottom of the page, i.e; after all other content.

Here's a diagram to explain better:

Here's the code:

I have prepared a demo: JSFiddle
Or see below

<div id="header">Header</div>
<div id="content">
    <p>Some content...</p>    
</div>
<div id="footer">Footer</div>

body{
    /* Just to enable scrolling in JSFiddle */
    height: 1000px;
}

#header{
    width: 100%;
    height: 100px;
    position: fixed;
    top: 0px;
    z-index: 1;
}

#content{
    width: 100%;
    position: absolute;
    top: 100px; /*Height of header*/
    z-index: 0;
}

#footer{
    width: 100%;
    height: 100px;
    position: absolute;
    bottom: 0px;
}

/*For demo only*/
#header, #footer{
    border: 3px dashed #333333;
    background: #FFFFFF;
}

#content{
    background: #CCCCCC;
    height: 200px;
}

As you have mentioned, position: fixed would position the footer with the respect to the viewport rather than the page itself. Therefore, we have to keep the element in normal flow and somehow position it to the bottom of the page.

There are couple of approaches to achieve that, which have been discussed in the wild during the time.
For instance:

A List Apart's article Exploring Footers - by Bobby Van Der Sluis, 2004
footerStickAlt - by Craig Erskine, 2005
Sticky Footer - by Shelly Cole, 2006
How to keep footers at the bottom of the page - by Matthew James Taylor, 2007
Make the Footer Stick to the Bottom of a Page - by Ryan Fait, 2007
Refined version of Ryan Fait's Sticky Footer - by Chris Coyier, 2009
Sticky CSS footers: The flexible way (which uses CSS Tables) - by Torben Haase, 2011
Responsive Sticky Footer (refined version of Torben's approach) - by Joshua Cook, 2013
Solved by Flexbox's Sticky Footer - by Philip Walton, 2013

Sticky Footer

In this answer I'd go with Ryan Fait's method since it is simple and easy to understand and also it meets your needs (Situations where both header and footer have fixed heights).

Considering the structure below:

<div id="content"> <!-- content goes here. It may (not) include the header --> </div>
<div id="footer">Footer</div>

The following steps are needed:

Setting height of the <html> and <body> elements to 100% which is required for the next step¹.
The most important thing we need to do is to make sure that the #content is high enough to push the #footer down the page. Hence we give the #content a min-height of 100%.
So far, the #content has taken 100% of height of the viewport, thus we should pull the footer up to position it at the bottom of the page. In order to do that we could give the #content a negative margin-bottom equivalent to the footer's height. Also to make sure that the footer appears on top of the content, we should position the footer relatively. Demo Here.
As can be seen, when the #content grows by its contents, some of the contents go behind the footer. We could avoid that either by appending a spacer element at the end of #content or use the combination of padding-bottom and box-sizing: border-box² which is supposed to be supported on IE8 as well.

4.1 Adding a spacer

Example Here

<div id="content">
    <!-- content goes here -->
    <div class="spacer"></div>
</div>
<div id="footer">Footer</div>

.spacer, #footer { height: 100px; }

4.2 Combination of `padding-bottom` and `box-sizing`

Updated Example

#content {
    min-height: 100%;
    margin-bottom: -100px; /* Equivalent to footer's height */
    padding-bottom: 100px; /* Equivalent to footer's height */

    box-sizing: border-box;
}

(Note that vendor prefixes omitted due to brevity)

Adding the Header

If the header should remain in normal flow, you could simply add it to the #content as follows:
(Example Here)
```
<div id="content">
    <div id="header">Header</div>
    ...
```
But if it should be positioned absolutely³, we need to push the contents of #content element down in order to prevent overlapping.

Therefore, again, we could either add a spacer at the beginning of #content (Example Here):

<div id="header">Header</div>
<div id="content">
    <div class="header-spacer"></div> 
    <!-- content goes here -->
    <div class="footer-spacer"></div> 
</div>
<div id="footer">Footer</div>

Or use the combination of padding-top and box-sizing as follows:

<div id="header">Header</div>
<div id="content"> <!-- content goes here. --> </div>
<div id="footer">Footer</div>

#content {
    min-height: 100%;
    margin-bottom: -100px; /* Equivalent to footer's height */

    padding-top   : 50px;  /* Equivalent to header's height */
    padding-bottom: 100px; /* Equivalent to footer's height */

    box-sizing: border-box;
}

Updated Example (Note that vendor prefixes omitted due to brevity)

At last but not least!

Nowadays, All major modern web browsers support box-sizing: border-box declaration (including IE8). However if you're looking for the traditional way which has a wider browser support, stick with using spacer elements.

^{1. This is needed to make min-height: 100% to work on the #content element (because a percentage value is relative to the height of the box's containing block which is established by the <body>). Also <html> should have an explicit height to make height: 100% to work on <body>.}

^{2. box-sizing: border-box makes UAs calculate the width/height of the box including padding and borders.}

^{3. According to spec, absolutely positioned elements are elements having a position of absolute or fixed.}

You almost got it. What you need is a container.

Here is my revised bit: JSFiddle Update

Add a container div:

<div id="container">
    <div id="header"></div>
    <div id="page"></div>
    <div id="footer"></div>
</div>

Then make the position relative, and the height 100%:

#container {
    height: 100%;
    position: relative;
}

And make sure the position is absolute for the footer.

Or for those who found this post by googling and want an even shorter answer, without wrappers (because you don't need them):

html { height: 100%; }
body { min-height: 100%; position: relative; padding-bottom: 3em; }
.footer { height: 3em; position: absolute; bottom: 0; }

done, the page is now at least 100% screen height, and the footer is at the bottom of the page, not the bottom of "the screen". If the page is longer than the screen, it'll still be at the bottom, and we did it without artificial "wrapper elements" or the likes: the body element is already the wrapper we need =)

The only caveat is that the body margin needs to be the same as the footer height, but then as negative value, since the "bottom: 0" rule will make the footer start at the bottom instead of baseline-anchored. Then again, as CSS, .less or .styl, this is trivially ensured.

To do it simple:

#header {
    position: fixed;
    width:100%;
    height:100px;
    top:0px;
    z-index:2;
}
#content, #footer {
    position: relative; /* or leave it static as by default */
    z-index:1;
}
body,div {
    margin:0; padding:0; /* http://jsfiddle.net/css/normalize.css */
}
#content {
    margin-top: 100px; /* the same value as header's height */
}

jsfiddle

But if you want the footer to take full size of the screen while #wrapper is 1000px and centered you would do:


<body>
<div id="wrapper">
<div id="wrapper-inner">
<div id="header"></div>
<div id="content"></div>
<div id="footer"></div>
</div>
</div>
</body>

html,
body {
margin:0;
padding:0;
height:100%;
}
#wrapper {
min-height:100%;
position:relative;
}
#wrapper-inner {
margin: 0 auto;
width: 1000px;
}
#content {
padding:10px;
padding-bottom:80px; /* Height of the footer element */
}
#footer {
width:100%;
height:80px;
position:absolute;
bottom:0;
left:0;
}

I'm pretty new at web development, and I know this has been answered already, but this is the easiest way I found to solve it and I think is somehow different. I wanted something flexible because my footer can have different heights on different sections of the web app. And I ended up using FlexBox and a spacer.

Start by setting the height for your html and body

html, body {
    height: 100%;
    display: flex;
    flex-direction: column;
    margin: 0px;
}

I'm assuming a column behavior for our app, in the case you need to add a header, hero or any content vertically aligned.

Create the spacer class

.spacer {
    flex: 1; 
}

So later on your HTML could be something like

<html>
  <body>
    <header> Header </header>
    Some content...
    <div class='spacer'></div>
    <footer> Footer </footer>
  </body>
</html>

You can play with it here https://codepen.io/anon/pen/xmGZQL

来源：https://stackoverflow.com/questions/18469262/position-footer-at-bottom-of-page-having-fixed-header

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