zotero/chrome/content/zotero-platform/win/overlay.css

:root {
	--theme-border-color: #cecece;
}

/* Hide horrible blue effect for menu bar and toolbar */
#navigator-toolbox {
	-moz-appearance: none;
}

#zotero-pane #zotero-toolbar {
	-moz-appearance: none !important;
	margin-top: -3px;
	border: 1px solid var(--theme-border-color);
}


@media (min-resolution: 1.25dppx) {
	#zotero-toolbar .toolbarbutton-icon {
		width: 16px;
	}
	
	#zotero-tb-sync > .toolbarbutton-icon {
		width: 20px;
	}
}

#zotero-tb-search-menu-button {
	margin: 0 -1px 0 -4px;
	padding: 5px 0 5px 5px;
	border: 0;
	background: transparent;
}

#zotero-tb-search-menu-button .button-menu-dropmarker {
	display: none;
}

#zotero-tb-search .textbox-search-icon {
	visibility: hidden;
}

#zotero-tb-sync-error {
	margin-right: 4px;
	padding-top: 4px;
}

#zotero-tb-sync {
	margin-right: 1px;
	padding-top: 4px;
}

#zotero-view-tabbox tab {
	padding-left: .7em;
	padding-right: .7em;
}

#zotero-toolbar {
	-moz-appearance: toolbox !important;
	padding-left: 2px;
}

#zotero-collections-splitter:not([state=collapsed]),
#zotero-items-splitter:not([state=collapsed]),
#zotero-tags-splitter:not([state=collapsed]) {
	border: 0;
	background-color: transparent;
	position: relative;
	/* Positive z-index positions the splitter on top of its siblings and makes
	it clickable on both sides. */
	z-index: 1;
}

#zotero-collections-splitter:not([state=collapsed]),
#zotero-items-splitter:not([state=collapsed]):not([orient=vertical]),
#zotero-tags-splitter:not([state=collapsed]) {
	border-inline-end: 1px solid var(--theme-border-color);
	min-width: 0;
	width: 3px;
	margin-inline-start: -3px;
}

#zotero-tags-splitter:not([state=collapsed]),
#zotero-items-splitter:not([state=collapsed])[orient=vertical] {
	border-block-end: 1px solid var(--theme-border-color);
	min-height: 0;
	height: 3px;
	margin-block-start: -3px;
}

#zotero-collections-splitter > grippy,
#zotero-items-splitter > grippy,
#zotero-tags-splitter > grippy {
	border: 0;
}

#zotero-collections-splitter:not([state=collapsed]) > grippy,
#zotero-items-splitter:not([state=collapsed]) > grippy,
#zotero-tags-splitter:not([state=collapsed]) > grippy {
	display: none;
}

#zotero-collections-tree, #zotero-items-tree, #zotero-view-item {
	-moz-appearance: none;
	border-style: solid;
	border-color: #818790;
	margin: 0;
	padding: 0;
}

treechildren::-moz-tree-twisty {
	padding: 0 4px;
}

/* Undo tree row spacing change in Fx25 on Windows */
#zotero-collections-tree treechildren::-moz-tree-row,
#zotero-items-tree treechildren::-moz-tree-row,
#zotero-prefs treechildren::-moz-tree-row {
	height: 1.6em;
}

tree {
	border-width: 0;
}

/* Restore row highlighting on drag over, though I'm not sure how we're losing it to begin with. */
#zotero-collections-tree treechildren::-moz-tree-row(dropOn) {
	background-color: Highlight;
}

#zotero-tag-selector groupbox {
	-moz-appearance: none;
	padding: 0;
	border: 0;
}

#tags-box {
	padding-top: 0.1em;
	padding-left: 0.05em;
}

#tags-box button {
	margin: .04em 0 0 .15em !important;
}

#zotero-editpane-tabs spacer {
	border: 0;
}

#zotero-view-item {
	padding: 0 !important;
	-moz-appearance: none;
	background-color: -moz-field;
	border-width: 1px 0 0  0;
	border-color: var(--theme-border-color);
}

#zotero-view-tabbox > tabs {
	margin-top: 2px;
}

#zotero-item-pane-groupbox {
	-moz-appearance: none !important;
	border-width: 0;
}

#zotero-editpane-item-box > scrollbox, #zotero-view-item > tabpanel > vbox, 
#zotero-editpane-tags > scrollbox, #zotero-editpane-related {
	padding-top: 5px;
}

#zotero-editpane-tags > scrollbox {
	padding-left: 5px;
}

#zotero-view-item > tabpanel > vbox {
	padding-left: 5px;
}