<div> centering

While sounding like a simple task, many people have had problems with it in the past. Centering in general norizontally and vertically is always a problem on websites. A problem for this I assume is that it is hard to define an anchor object for the object to center. A <div> object in HTML can be used in many ways and is used to group other elements together and can be thought of as kind of a box. Without any configuration a <div> object fills out the whole length of its father object and if you add a <div> object within this one which has a fixed length, it will be anchored to the left. Therefore the problem or question on how to center it even exists.
2 answers

There are many solutions for this:

1. add this to the child (note: a width needs to be specified):

margin-left: auto;
margin-right: auto;

2. use text-align: center

3. use flexbox

CSS solution

This article solves the following challenge: 

<div> centering

One solution to the problem would be to apply the following CSS to the inner object:
#inner {
display: table;
margin: 0 auto;

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