@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 }

}