/*
Source - https://stackoverflow.com/a
Posted by Billbad, modified by community. See post 'Timeline' for change history
Retrieved 2025-11-11, License - CC BY-SA 4.0
*/

.outer {
  display: table;
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
}

.middle {
  display: table-cell;
  vertical-align: middle;
}

.inner {
  margin-left: auto;
  margin-right: auto;
  width: 400px;
  /* Whatever width you want */
}