Totally new to BTT - Using Auto-Generated Safari Favicons as Buttons?

Hi. You know how Safari generates buttons based on your favorites when you have a window open? I want THOSE buttons, but to have them on my touch bar at all times, not just in Safari. What I did for one in testing is screenshot the bar, crop the icon, then created one in BTT. But it has huge "bezels" on either side. I changed the "free space after button" to negative 40 and it got rid of the gap on the right side, but there's still a massive gap between the escape button and the first icon. The gap acts as the new button still.

See screenshot for test button (Twitch).

See screenshot of BTT settings.

Any tips?