OK – your site’s CSS is notably different to that of our demo site so we’ll need a different approach here (to save time in the future it is generally best just to link directly to a live example on your own site, as every site is different) 🙂
Something like the following CSS (again, it should be possible to add this to a custom tribe-events.css stylesheet) should work:
.tribe-events-tickets td div.quantity.buttons_added {
height: 40px;
position: relative;
}
.tribe-events-tickets td input.input-text.qty {
height: 36px;
width: 64px;
}
.tribe-events-tickets td input.minus {
float: right;
height: 18px;
position: relative;
right: 15px;
}
.tribe-events-tickets td input.plus {
float: right;
clear: right;
height: 18px;
position: relative;
right: 15px;
}