1. Set your browser to the default zoom level
Does some text on the site appear to be out of place? Is the layout messed up, or the login link covered up? If so, try setting your web browser's zoom level back to the default 100%. Normally you can do this by pressing the Ctrl and 0 keys on your keyboard at the same time (that's the control key--or Command key on Macs--and the zero key). If you're having difficulty, please see this page for a more thorough guide, and/or follow the steps below to reset your browser.
2. Check that your browser is up-to-date
Visit http://whatbrowser.org which will tell you if you are using the latest version of your browser. If you are not using the latest version, try updating your browser.
3. Does using a different browser solve the problem?
If your browser is fully updated, and the problem is still not resolved, try downloading and using one of the other browsers listed at http://whatbrowser.org (we recommend Chrome, or Firefox). You do not need to switch your main browser permanently, but trying a different browser to see if it resolves the problem is a key troubleshooting step.
4. Try resetting your main browser
If using a different browser solves the issue, then the main browser that you were using before probably needs to be reset to its default settings. You can reset your browser by following one of these guides (depending on which browser you need to reset):