// breakpoints
$S: 320px;
$M: 768px;
$L: 1170px;
// media queries
@mixin MQ($canvas) {
@if $canvas == S {
@media only screen and (min-width: $S) { @content; }
}
@else if $canvas == M {
@media only screen and (min-width: $M) { @content; }
}
@else if $canvas == L {
@media only screen and (min-width: $L) { @content; }
}
}