How to center div within another div?

Tags: html,css

Problem :

I'm learning how to use the position relative/absolute.

However, I've come a little stuck.

I'm trying to horizontally center a div within a div but when I add margin: 0 auto; it does nothing.

I've made a Fiddle.

Or here's the code:

<html lang="en-UK">
        <link href="DivTest.css" rel ="stylesheet" type="text/css">
    <div id="header"></div>
    <div id="outer">
        <div id="inner"></div>


body, html {
     margin: 0;
     width: 100%;

     position: relative;
     width: 100%;
     height: 200px;
     background-color: lightgreen;
     margin: 0 0 20px 0;

     position: relative;
     width: 800px;
     height: 500px;
     background-color: red;
     margin: 0 auto;


     position: absolute;
     width: 200px;
     height: 250px;
     background-color: lightblue;
     margin: 0 auto;

Any help would be appreciated.

Solution :

Just remove the position:absolute; property for #inner


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