.flex-box {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 15px;
}

.flex-box-text {
  font-size: 21px;
}

@media screen and (max-width: 768px) {
  .flex-box-text {
    font-size: 3.2vw;
  }
}