NodeBB/public/scss/modals.scss

.tool-modal {
	position: fixed;
	bottom: 10%;
	right: 2rem;
	z-index: $zindex-modal;
	[component="category-selector-selected"] span {
		display: inline-flex!important;
	}
	.bootstrap-tagsinput {
		input {
			width: 100%;
		}
		.ui-autocomplete {
			max-height: 350px;
			overflow-x: hidden;
			overflow-y: auto;
		}
	}
}

@include media-breakpoint-down(md) {
	.tool-modal {
		margin: 0 $spacer;
		right: 0;
	}
}

@include media-breakpoint-up(md) {
	.tool-modal {
		max-width: 500px;
	}
}