html,
body {
  height: 100%;
}
body {
  margin: 0;
}
.flex-container {
  height: 100%;
  padding: 0;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.row {
  width: auto;
  border: 1px solid black;
}
.flex-item {
  background-color: #2196f3;
  padding: 5px;
  width: 250px;
  height: 200px;
  margin: 10px;
  line-height: 20px;
  color: white;
  font-weight: bold;
  font-size: 2em;
  text-align: center;
}
.t-s {
  text-shadow: 1px 1px 2px black;
}
.one {
  color: #ff6600;
}
.two {
  color: #ffd700;
}
.three {
  color: #ffffff;
}
.four {
  color: #2196f3;
  text-shadow: 1px 1px 2px #ffffff;
}