Template:GuestAppearances/styles.css

.GuestAppearance-section-stream-game,
.GuestAppearance-items, 
.GuestAppearance-item {
	display: inline;
}

.GuestAppearance-items {
	margin-left: 0.3em;
}

.GuestAppearance-item::after {
	display: inline;
	content: ",";
}

.GuestAppearance-item:last-of-type::after {
	display: none;
	content: unset;
}