Have you tried clearing your browsers cache, switching browsers, or restarting your computer? I'd start with these things and see if the problem resolves itself.
@kimberly_teague I have seen this before when the CSS is either not loading, or the CSS has become corrupt.
When this happened, was their any customization being done to the styling for your Canvas instance?
Hi there, @jamesm18451 Thank You for posting your question here. Your issue sounds like something with your web browser. Are you using either Google Chrome or Mozilla Firefox? If so, is that browser up-to-date? Please see Which browsers does Canvas support? for more information...keeping in mind that Internet Explorer is no longer a supported browser when navigating around the Canvas environment. If you are already using Chrome or Firefox, you might consider downloading the other browser to see if that one works instead. If you are still having issues after that, then I would recommend that you reach out to Canvas Support...as they might be able to hep you more.
I hope this information will be of help to you, James. Please let Community members know if you have any other questions about this...thanks!