@mixin flex($display, $align-items, $justify-content) {
  display: $display;
  align-items: $align-items;
  justify-content: $justify-content;
}

@mixin centered-content() {
  @include flex(flex, center, center);
}

@mixin stretched-centered-content() {
  @include flex(flex, stretch, center);
}

@mixin stretched-start-content() {
  @include flex(flex, stretch, flex-start)
}