css centering things code example

Example 1: centering horizontally

div.center{display:block;margin:auto;width:50%;}
p.center{text-align:center;}

Example 2: how to assign something in center inside a div

IMG.displayed {
    display: block;
    margin-left: auto;
    margin-right: auto }
...
<IMG class="displayed" src="..." alt="...">

Example 3: how to assign something in center inside a div

P { text-align: center }
H2 { text-align: center }