Is there a way to get rid of that red outline on media that doesn't have alt-text?

I find it really annoying and distracting while it makes no difference to me to know if they have alt-text or not before my brain even registers what the media is about. Couldn't find a setting about it in Preferences

@opponent019 Custom CSS ought to do it, there are various browser extensions for that. This seems to be the current selector, but you may have to update it in the future if they change it.

.media-gallery__item-thumbnail img:not([alt]), .media-gallery__item-thumbnail img[alt|=""], .audio-player__canvas:not([aria-label]), .audio-player__canvas[aria-label|=""], .video-player video:not([aria-label]), .video-player video[aria-label|=""], .media-gallery__gifv video:not([aria-label]), .media-gallery__gifv video[aria-label|=""] {
border: unset;
}
@player_03 ooh thank you, but wouldn't that be only available for admins and affecting the whole server? I looked for these plugins (I'm using Firefox) but couldn't find any 
@opponent019 Try Stylus, that's specifically designed for custom CSS. I think Greasemonkey and Tampermonkey can do CSS too, though that's not their main purpose.
Stylus – Get this Extension for 🦊 Firefox (en-US)

Download Stylus for Firefox. Redesign your favorite websites with Stylus, an actively developed and community driven userstyles manager. Easily install custom themes from popular online repositories, or create, edit, and manage your own personalized CSS stylesheets.

@player_03 ooh haha I was looking for mastodon specific plugins, I see now, thank you!