@media (--breakpoint-sm) {
  .sm-relative { position: relative }
  .sm-absolute { position: absolute }
  .sm-fixed    { position: fixed }

  .sm-top-0    { top: 0 }
  .sm-right-0  { right: 0 }
  .sm-bottom-0 { bottom: 0 }
  .sm-left-0   { left: 0 }
}