Fix opacity value

terminalrc

@@ -26,7 +26,7 @@ MiscSlimTabs=FALSE
 MiscNewTabAdjacent=FALSE
 MiscSearchDialogOpacity=100
 MiscShowUnsafePasteDialog=FALSE
-BackgroundDarkness=1.000000
+BackgroundDarkness=0.800000
 RunCustomCommand=TRUE
 CustomCommand=tmux
 FontName=Source Code Pro 9