how to align text in the middle of a div in html code example

Example 1: css align items vertical center

.parent {
  display: flex;
  justify-content: center;
  align-items: center;
}

Example 2: centering horizontally

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

Example 3: how to set text to middle in div

.center {
  margin: auto;
  width: 50%;
  border: 3px solid green;
  padding: 10px;
}