Pagetabs/pagetabsmore/style.css

.more-dropdown-button {
	width: 25px;
	height: 25px;
	display: inline-flex;
	justify-content: center;
	align-items: center;
	border-radius:2px;
}

.more-dropdown-button:hover {
	background:#e9edef;
}

.more-dropdown-button:active {
	background:#e9edef;
	outline:1px solid #d9d6d3;
}

.mw-collapsible:not(.mw-collapsed) ~ .more-dropdown-button {
	outline:2px solid blue;
}