position relative center code example

Example 1: position absolute center

.child {
    position: absolute;
    top: 50%;  
    left: 50%; 
    transform: translate(-50%, -50%);
}

Example 2: how to center in absolute position

position: absolute;
margin-left: auto;
margin-right: auto;
left: 0;
right: 0;
text-align: center;

Example 3: 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 4: how to assign something in center inside a div

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