Example 1: center div horizontally and vertically

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

Example 2: centering horizontally

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

Example 3: how to center horizontally and vertically block div

#html code

	
CSS is cool


#css code
.parent{
  display:grid;
  place-items:center;
  
  width:560px; 
  height: 560px;
}