@id : '';
@color : '';
@font_size : '';
@color_hover : '';

#@{id} {
    .color (@color) when not (@color=~'') {
        color: @color!important;
    } .color (@color);    
    
    .font_size (@font_size) when not (@font_size=~'') {
        font-size: @font_size!important;
    } .font_size (@font_size);    
}

#@{id}:hover {
    .color_hover (@color_hover) when not (@color_hover=~'') {
        color: @color_hover!important;
    } .color_hover (@color_hover);        
}