zotero/scss/components/_contextPane.scss

#tabs-deck {
	min-width: 600px;
}

#zotero-context-pane {
	display: flex;
	min-width: 360px;

	.divider {
		border-bottom: 1px solid var(--fill-quinary);
		margin: 0 8px;
	}

	&.stacked {
		position: fixed;
		right: 0;
		top: 0;
		bottom: 0;
		font-size: 0;
		pointer-events: none;
	}

	&.stacked-context-placeholder {
		min-height: 300px;
	}
	&.standard .stacked-context-placeholder {
		display: none;
	}
}

#zotero-context-splitter-stacked {
	pointer-events: auto;
}

#zotero-context-pane-inner {
	width: 0;
	background: var(--material-background);
	font: message-box;
	font-size: inherit;
	min-height: 100px;
	height: 0;
	pointer-events: auto;
}

#zotero-item-toolbar {
	height: 32px;
}

.zotero-context-notes-list {
	background-color: var(--material-sidepane);
}

.zotero-context-note-container {
	background-color: var(--material-background);
}

.zotero-context-pane-editor-parent-line {
	height: 40px;

	& .parent-title-container {
		display: flex;
		align-items: center;
		padding: 6px 8px;
	}

	& .parent-item-type {
		margin-inline-end: 3px;
		width: 16px;
	}

	& .parent-title {
		flex-grow: 1;
		width: 0;
		white-space: nowrap;
		overflow: hidden;
		text-overflow: ellipsis;
		margin-left: 8px;
	}
}

.zotero-tb-note-return {
	@include svgicon-menu("chevron", "universal", "20");
	rotate: 90deg;
	padding: 4px;
	width: 28px;
	height: 28px;
}

#zotero-context-pane[collapsed=true] .notes-list-container,
#zotero-context-pane-inner[collapsed=true] .notes-list-container,
#zotero-context-pane[collapsed=true] .zotero-view-item > tabpanel > *,
#zotero-context-pane-inner[collapsed=true] .zotero-view-item > tabpanel > * {
	overflow: unset !important;
}