Positioning text within a parent div
For a document that looks like this:
This paragraph…
the style sheet looks like this:
div.container3 {
height: 10em;
position: relative } /* 1 */
div.container3 p {
margin: 0;
position: absolute; /* 2 */
top: 50%; /* 3 */
transform: translate(0, -50%) } /* 4 */
The essential rules are: