.flex {display: flex;}
.flex-row {flex-direction: row;}
.flex-rr {flex-direction: row-reverse;}
.flex-column {flex-direction: column;}
.flex-wrap {flex-wrap: wrap;}
.flex-1 {flex: 1}
.a-center {align-items: center;}
.a-start {align-items: flex-start;}
.a-end {align-items: flex-end;}
.j-center {justify-content: center;}
.j-start {justify-content: flex-start;}
.j-end {justify-content: flex-end;}
.j-sa {justify-content: space-around;}
.j-sb {justify-content: space-between;}
.j-se {justify-content: space-evenly;}