Spell check pop-up window white text on white background in some browsers

Samsung Galaxy S10e, Android 10, Swiftkey version 7.5.3.5. When using SwiftKey, I have found that both Opera and Chrome browsers display a spell check pop-up window in white text on a white background, making it unreadable. I have tried both Samsung keyboard and Gboard and neither of them have the spell check pop-up window. Firefox browser does not seem to have the spell check pop-up window. Samsung browser displays the spell check pop-up window correctly, with black text on a white background. Which site I am on does not appear to matter.