@media only screen and (max-width: 600px) {
  .two-column, {
    display: flex;
    flex-direction: column;
  }
}
@media only screen and (min-width: 601px) {
    .two-column, {
    display: flex;
    flex-direction: row;
}
.two-column div {
  flex:1; 

  display:flex;
  justify-content:center;
  align-items:center;
  text-align:center;
  flex-direction:row;
}