Splash Screen Alignment

I'm developing my first iOS app (xcode 10) and have been having some trouble aligning the splash screen. 'Align Center X is currently aligned superview' and I've made constraints to height and width, but it's still not aligned the way I want. Content mode is 'Aligned Fill'. It's still not covering the top and bottom of the screen, and I want it to fill the entire screen. Can someone with experience please help?

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Update: Got it to work, but it "doesn't have constraints" so I'll need to add some I guess. I checked the view with all of the iPhones though and it looks good on all iPhones. Is it necessary to add constraints?