@for $i from 2 through 14{
    button[data-suit="club"][data-points="#{$i}"] {
        background: url("cards.png");
        width: 80px;
        height: 115px;
        $test: 80;
        background-position-x: $test + 'px';
        background-size: 1000px;
    }
}

sudo su -c "gem install sass"
sudo gem install sass