It looks normal over here, but the text appears completely white on my notebooks!
I have had the issue of the default color of the plain text (and free-form input) being 'black' on the color-selector, but always appearing white, it must be clicked to be black again for it to appear black and not camouflage with the background. At least here it can be highlighted to be seen, but this is not an option on the notebooks I create. How can I change the default color of my text and background? Is it my browser?
You can make a custom stylesheet or edit the default ones. https://reference.wolfram.com/language/tutorial/WorkingWithStylesheets.html