Why ColorAndOpacity of my Slate SWidget look so dark

Development Programming & Scripting C++
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1 
ChildSlot
	[
		SNew(SHorizontalBox)
		+ SHorizontalBox::Slot()
		[
			SNew(SButton)
			.ButtonColorAndOpacity(FLinearColor::Red)
		]
		+ SHorizontalBox::Slot()
		[
			SNew(SSeparator)
			.ColorAndOpacity(FLinearColor::Red)
		]
	];

the widget create by my code looks like:

image
image797×554 1.34 KB

I’m pretty sure the color showed is not red,it looks really darker in SSeparator.

How can I fix it?