Sometimes you may encounter situations where the font size of the web page you are looking at changes. It either gets bigger or smaller. The page you are viewing may seem to be totally zoomed in or out.
This sometimes happens when you inadvertently pressed on the "Ctrl" key and used the mouse wheel (Ctrl + mouse wheel).
To go back to the default resolution or font size, press on Ctrl + 0 (Ctrl + the zero number key).
Additionally, you can press and hold the Ctrl key and scroll the mouse wheel forward and back to zoom in and out of the page.