#tbl.countdown_holder {
  display: -webkit-box !important;
  display: -ms-flexbox !important;
  display: flex !important;
  -webkit-box-orient: horizontal;
  -webkit-box-direction: normal;
      -ms-flex-direction: row;
          flex-direction: row;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
  -webkit-box-pack: center !important;
      -ms-flex-pack: center !important;
          justify-content: center !important;
  max-width: 900px;
  border: 1px solid grey;
  border-spacing: 0px;
  background-color: white;
  margin: 50 auto 20 auto;
}

.countdown_holder div {
  font-family: Helvetica, san-serif;
  width: 80px;
  height: 80px;
  color: #fff;
  font-size: 4em;
  padding: 2px;
  text-align: center;
  border: solid 2px #fff;
  background-color: white;
  display: flex;
  align-items: center;
  justify-content: center;
}

@media screen and (max-width: 600px) {
  .countdown_holder div {
    font-size: 2em;
  }
}