.close-extra-content {
	display: none;
}

/***/
.navigation-contents-link[data-index="0"] {
	display: none;
}


/* #navigation-book-tabs {
	grid-template-columns: repeat(4, auto) !important;
	gap: 0;
}
.navigation-book-tab {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	overflow: hidden;
	letter-spacing: 1px;
	padding-left: .2em;
	padding-right: .2em;
}
.navigation-book-tab[data-bookindex="2"],
.navigation-book-tab[data-bookindex="3"] {
	color: var(--text-black) !important;
}
html.no-touch .navigation-book-tab[data-bookindex="2"]:hover,
html.no-touch .navigation-book-tab[data-bookindex="3"]:hover {
	background-color: var(--method-500) !important;
}
.navigation-book-tab > div {
	font-size: .5em;
	white-space: pre;
} */