css center vertically and horizontally in div code example

Example 1: css center horizontally and vertically

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

Example 2: centering horizontally

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