Overleaf/services/web/public/stylesheets/components/ui-select.less

.ui-select-bootstrap > .ui-select-choices,
.ui-select-bootstrap > .ui-select-no-choice {
	width: auto;
	max-width: 400px;
}

.dropdown-menu .ui-select-choices-row {
	padding: 4px 0;

	> .ui-select-choices-row-inner {
		overflow: hidden;
		text-overflow: ellipsis;
	}
}

.ui-select-placeholder,
.ui-select-match-text {
	overflow: hidden;
	text-overflow: ellipsis;
	font-weight: normal;
}

.ui-select-bootstrap {
	&:focus {
		outline: none;
	}
	> .ui-select-match  {
		&:focus {
			outline: none;
		}
		&.btn-default-focus {
			outline: 0;
			box-shadow: none;
			background-color: transparent;
			> .btn {
				border-color: @input-border-focus;
				box-shadow: inset 0 1px 1px rgba(0,0,0,0.075), 0 0 8px fade(@input-border-focus, 60%);
				padding-top: @input-suggestion-v-offset;
			}
		}
		> .btn {
			color: @input-color;
			background-color: @input-bg;
			border: 1px solid @input-border;
			padding-top: @input-suggestion-v-offset;
			&[disabled] {
				cursor: not-allowed;
				background-color: @input-bg-disabled;
				opacity: 1;
			}
		}
	}
}

.ui-select-container[tagging] {
	.ui-select-toggle {
		cursor: text;
		padding-top: @input-suggestion-v-offset;
		> i.caret.pull-right {
			display: none;
		}
	}
}