flex items side by side in a table code example

Example: how to put two items befside each other using flexbox

.flex-column {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-gap: 5px;
}

.column-item:nth-of-type(-n + 3) {
  grid-column: span 2;
}

.column-item {
  background-color: lightgreen;
}