@function top($box) { @return parsebox($box, 1); } @function right($box) { @return parsebox($box, 2); } @function bottom($box) { @return parsebox($box, 3); } @function left($box) { @return parsebox($box, 4); } @mixin no-selection() { -webkit-touch-callout: none; -webkit-user-select: none; -khtml-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none; }