[flex] {
  display: flex;
  align-items: center;
}

[flex-center] {
  @extend [flex];
  justify-content: center;
}

[flex-between] {
  @extend [flex];
  justify-content: space-between;
}

[flex-between-start] {
  @extend [flex-between];
  align-items: flex-start;
}

[flex-wrap],
.flex-wrap {
  @extend [flex];
  flex-wrap: wrap;
}