@mixin SmallDevice(){
    @media(min-width:$screen-sm-min){
        @content;
    }
}

@mixin MediumDevice(){
    @media(min-width:$screen-md-min){
        @content; 
    }
}

@mixin LargeDevice(){
    @media(min-width:$screen-lg-min){
        @content; 
    }
}