.wrapper { display: table; }

.cell {
  display: table-cell;
  margin: 0;
  padding: 20px;
  text-align: center;
  vertical-align: middle;
}
.digits
{
    display: flex;
    max-height: 90px;
}
.cntSeparator
{
    padding-top: 20px;
    float: none;
    font-size: 24pt;
    display: inline;
    margin: 0 5px;
}
.cntDigit
{
    float: none;
    margin: 0 5px;
}