.@{content-holder} {
  margin-left: auto;
  margin-right: auto;
  width: @content-max-width;
  max-width: calc(100% ~" - " 2 * @content-min-margin);
}

.@{center-vertically} {
  .display-flex;
  height: 100%;
  &.@{horizontally} {
    justify-content: center;
  }
  > * {
    align-self: center;
  }
}