如何将页脚位置保持在多个页面上的内容之下

Question

So I am learning HTML, CSS, PHP, and I am using php include to add the header & footer I can set the footer to a certain height for each page or set it invidually by creating separate stylesheets.

Is there a way to get the footer to appear under content for every page using php include? When the content is different lengths on each page?

Here is my footer code

HTML

<footer>
  <ul>
    <a href="../../page1.php">
      <li>page1</li>
    </a>
    <a href="../../page2.php">
      <li>page2</li>
    </a>
    <a href="../../page3.php">
      <li>page3</li>
    </a>
    <a href="../../page4.php">
      <li>page4</li>
    </a>
    <a href="../../page5.php">
      <li>page5</li>
    </a>
  </ul>
</footer>

CSS

footer {
  padding: 20px;
  margin-top: 450px;
  height: 1%;
  color: #ffffff;
  background-color: #30323D;
  text-align: center;
}

footer ul {
  margin-left: 0;
  padding: 0;
  list-style-type: none;
  float: left;
}

footer ul a {
  text-decoration: none;
  color: #fff
}

footer p {
  margin-top: 120px;
}

When using position absolute

Answer 1

I have been able to fix the issue I was experiencing

Here is a JSFiddle

https://jsfiddle.net/lewisjames101/4h20Lwzm/

HTML
<div id="container">
<div id="header">My Header</div>
<div id="body">Small amount of content</div>
<div id="footer">My Footer</div>
</div>



CSS

html,
body {
margin:0;
padding:0;
height:100%;
}
#container {
min-height:100%;
position:relative;
}
#header {
background:#ff0;
padding:10px;
}
 #body {
 padding:10px;
 padding-bottom:60px;   /* Height of the footer */
 }
 #footer {
 position:absolute;
 bottom:0;
 width:100%;
 height:60px;   /* Height of the footer */
 background:#6cf;
 }

Thank you for your input, it was helpful