[CSS] Position on page

Examples

{
margin-top:20px;
margin-right:auto;
margin-bottom:20px;
margin-left:auto;
padding-top:0;
padding-right:10px;
padding-bottom:0;
padding-left:10px;
}

{
margin:20px auto 20px auto;
padding:0 10px 0 10px;
}

{
margin:20px auto;
padding:0 10px;
}