margin 0 0 code example

Example 1: margin 0 auto

Specifying 0 tells the browser to set the top and bottom margin to 0.

Specifying auto tells the browser to automatically determine the left
and right margins equally.

It's the same as:

margin-top:0;
margin-bottom:0;
margin-left:auto;
margin-right:auto;

Example 2: how do I add a vertical margin in css

subject {
  margin-top: /*the size of the margin */ (example: 100px)
  /* or */
  margin-bottom: /*the size of the margin */ (example: 100px)
}