css middle vertical-align code example

Example 1: vertical align css

.container{
  display: table;
}

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

Example 2: how to make the text vertically centered in css

/*attention, i used this code because i had to center a div with text in another div without text*/
div{
  position: relative;
  top: 25%;
  bottom: 25%;
}