I can understand coding:

body {

	color: #ffffff;

	text-align: center;

	margin: 5px 0;

}

But I don't understand what is the following code meaning:

* { margin: 0; padding: 100; outline: 0; }
Member Avatar for diafol

This is the universal selector. It means everything (tag) takes the values in the braces.

div.ardav * {color: red;}

this will make every element inside the <div class="ardav"> red

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