If you want to zoom in or zoom out of a web page to make the font bigger or smaller, a simple trick is to use the control key and the scroll on on your mouse: Hold the control key (Ctrl) and then spin the scroll up or down. The scroll wheel is located between the left and right buttons on the mouse. Not every mouse has a scroll, so you can also use the control key with the plus sign and minus sign. A third option is to hit the ALT key plus "P" to pull up the page menu and then select "zoom".
This is a good trick to remember if you find a small font size on your screen one day. Since is possible to change the size by mistake, it's good to know how to change it back.