what is position fixed in css code example

Example 1: fixed positioning html

/*
position: fixed;
An element with position: fixed; is positioned relative to the viewport, 
which means it always stays in the same place even if the page is scrolled. 
The top, right, bottom, and left properties are used to position the element.
ex; Navigation BARS
A fixed element does not leave a gap in the page where it would normally have
been located.

Here is the CSS that is used:*/

div.fixed {
  position: fixed;
  bottom: 0;
  right: 0;
  width: 300px;
  border: 3px solid #73AD21;
}

Example 2: css position

h2.pos_left {
  position: relative;
  left: -20px;
}

h2.pos_right {
  position: relative;
  left: 20px;
}

Example 3: popsition relative css

An element with position: relative; is positioned relative to its normal position. Setting the top, right, bottom, and left properties of a relatively-positioned element will cause it to be adjusted away from its normal position. Other content will not be adjusted to fit into any gap left by the element.