.code{counter-reset:line;font-size:1.2rem;line-height:2rem}.line{display:block;position:relative;padding-left:3em}.line:before{content:counter(line);counter-increment:line;position:absolute;left:0;width:2.5em;text-align:right;margin-right:1em;color:grey}@media screen and (max-width:600px){.code{font-size:.85rem;line-height:1.5rem}}