@mixin singleElevation($arg1,$arg2,$arg3){
  box-shadow:  0px 2px 2px $arg1, 0px 1px 1px $arg2, 0px -1px 0px $arg3;
}
@mixin doubleElevation($arg1,$arg2,$arg3){
  box-shadow: 0px 4px 4px $arg1, 0px 2px 2px $arg2, 0px -1px 0px $arg3;
}
@mixin tripleElevation($arg1,$arg2,$arg3){
  box-shadow: 0px 8px 8px $arg1, 0px 4px 4px $arg2, 0px -1px 0px $arg3;
}