Thunderbird_91_ESR/css/general/toolbar_and_ui_appearance_aero.css
/* Thunderbird userChrome.css tweaks ************************************************************/
/* Github: https://github.com/aris-t2/customcssfortb ********************************************/


/* menubar */
#messengerWindow .chromeclass-menubar{
  border-bottom: 0px !important;
}

window:not(#messengerWindow) .toolbox-top:not(:-moz-lwtheme),
window:not(#messengerWindow) .mail-toolbox:not(:-moz-lwtheme),
dialog .mail-toolbox:not(:-moz-lwtheme),
#messengerWindow .mail-toolbox:not(:-moz-lwtheme) {
  background: linear-gradient(#eaf2fb,#dceaf9) !important;
}

#messengerWindow:not(:-moz-lwtheme) #mail-bar3:not(:-moz-lwtheme){
  background: unset !important;
}

/**/
#messengerWindow:not(:-moz-lwtheme) .contentTabToolbox {
  appearance: none !important;
  background: #eaf2fb !important;
}
#messengerWindow:not(:-moz-lwtheme) .contentTabToolbox .searchBox {
  appearance: none !important;
  background: #ffffff !important;
  color: #000000 !important;
}
#messengerWindow:not(:-moz-lwtheme) .contentTabToolbox .searchBox .contentTabUrlbar {
  padding-left: 4px !important;
  padding-right: 4px !important;
}

/* filter bar */
#messengerWindow:not(:-moz-lwtheme) :is(#quick-filter-bar,#quick-filter-bar-main-bar) {
  appearance: none !important;
  background: #dbeaf9 !important;
}

/* attachment bar */
#messengerWindow:not(:-moz-lwtheme) #attachmentBar{
  background: #dbeaf9 !important;
}

/* folder pane bar */
#messengerWindow:not(:-moz-lwtheme) #folderPane-toolbar{
  background: #dbeaf9 !important;
}

/* header */
#messengerWindow:not(:-moz-lwtheme) #expandedHeadersBox {
  background: #eef3fa !important;
}

/* Lightning */
#messengerWindow:not(:-moz-lwtheme) #unifinder-searchBox,
#messengerWindow:not(:-moz-lwtheme) #task-addition-box,
#messengerWindow:not(:-moz-lwtheme) #calendar-nav-control{
  background: #dbeaf9 !important;
}

/*status bar*/
#messengerWindow:not(:-moz-lwtheme) statusbar,
#messengerWindow:not(:-moz-lwtheme) #status-bar {
  appearance: none !important;  
  border-top: unset !important; 
  padding-inline-end: 0px !important;
}

@media all and (-moz-windows-classic) {
	#messengerWindow:not(:-moz-lwtheme) statusbar,
	#messengerWindow:not(:-moz-lwtheme) #status-bar {
	  border: unset !important;  
	}
	
	.chromeclass-status:not(:-moz-lwtheme) statusbarpanel,
	.chromeclass-status:not(:-moz-lwtheme) .statusbar-resizerpanel{
	  appearance: none !important;  
	  background: #dbeaf9 !important;
	  border-left: 0px !important;
	  border-right: 0px !important;
	  border-bottom: 0px !important;
	}
}

#messengerWindow:not(:-moz-lwtheme) #status-bar,
#messengerWindow:not(:-moz-lwtheme) #status-bar statusbarpanel,
#messengerWindow:not(:-moz-lwtheme) #status-bar .statusbar-resizerpanel{
  appearance: none !important;  
  background: #dbeaf9 !important;
  /*border-top: 1px solid rgba(0,0,0,.2) !important;*/
  border-left: 0px !important;
  border-right: 0px !important;
  border-bottom: 0px !important;
}

#messengerWindow:not(:-moz-lwtheme) #status-bar {
  border-top: 1px solid rgba(0,0,0,.2) !important;
}

#messengerWindow:not(:-moz-lwtheme) #status-bar .statusbar-resizerpanel{
  display: -moz-inline-box !important;
}

#messengerWindow:not(:-moz-lwtheme) #status-bar statusbarpanel toolbarbutton{
  background: unset !important;
}

#messengerWindow:not(:-moz-lwtheme) .contentTabInstance notification {
  background-color: #dbeaf9 !important;
}

resizer {
  appearance: none !important;
}

/* Lightning */
#messengerWindow:not(:-moz-lwtheme) #today-pane-panel:not(:-moz-lwtheme) > sidebarheader,
#messengerWindow:not(:-moz-lwtheme) #today-pane-panel:not(:-moz-lwtheme) {
  background-color: #eaf2fb !important;
}
#messengerWindow:not(:-moz-lwtheme) #today-pane-panel > sidebarheader {
  border-top: 1px solid rgba(10%, 10%, 10%, .4) !important;
}

/* Win8/10 tweaks*/
@media (-moz-os-version:windows-win8),(-moz-os-version:windows-win10) {
  @media all and (-moz-windows-theme:aero) {
	#mail-toolbar-menubar2:not(:-moz-lwtheme) {
      background: #eaf2fb !important;
	}
  
	/* appmenus first pane */
	#messengerWindow #appmenuPrimaryPane{
	  background: white !important;
	}

	/* appmenus second pane */
	#messengerWindow #appmenuSecondaryPane{
	  background: #f1f5fb !important;
	}
  }
}

#messengerWindow:not(:-moz-lwtheme) #folderTree,
#messengerWindow:not(:-moz-lwtheme) #dirTree,
window:not(#messengerWindow) .chromeclass-menubar:not(:-moz-lwtheme),
#msgcomposeWindow:not(:-moz-lwtheme) .toolbox-top{
  background: #eaf2fb !important;
}
	
.chromeclass-status:not(:-moz-lwtheme) statusbarpanel,
.chromeclass-status:not(:-moz-lwtheme) .statusbar-resizerpanel{
  appearance: none !important;  
  background: #dbeaf9 !important;
  border-left: 0px !important;
  border-right: 0px !important;
  border-bottom: 0px !important;
}

#messengerWindow[windowtype="mail:messageWindow"] #mail-toolbar-menubar2:not(:-moz-lwtheme) {
  appearance: none !important;
  background: #eaf2fb !important;
}
