Answers for "vertical align doesn't work"

vertical align css

/*
For a flexed item you can you align - items to center content vertically
you can use justify content to center horizontally
*/

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

vertical align css

.container{
  display: table;
}

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