body {
  background-color: black;
  color: white;
  font-family: Verdana;
}
.flex {
display: flex;
}
.flex-row {
flex-direction: row; /* default: row | row-reverse | column | column-reverse */
}
.flex-col {
flex-direction: column; /* default: row | row-reverse | column | column-reverse */
}
.items_center {
align-content: center; /* flex-start | flex-end | center | space-between | space-around | stretch */
}
.flex-wrap {
flex-wrap: wrap; /* default: nowrap | wrap | wrap-reverse */
}