On the bottom right of the Opera screen,
click the arrow next to the Change Zoom Level button
You will then see the following options:
To go to a predefined zoom level, click the percentage of enlargement or reduction you want.
- or -
To specify a custom level, click Custom. In the Percentage zoom box, type a zoom value, and then click OK.
If you have a mouse with a wheel, hold down the CTRL key, and then scroll the wheel to zoom in or out.
If you click the Change Zoom Level button , it will cycle through from 20% up to 1000%, giving you a quick enlargement of the entire webpage.
From the keyboard you can increase or decrease the zoom value in %age increments.
To zoom in, press CTRL+PLUS SIGN (+).
To zoom out, press CTRL+MINUS SIGN (-).
To restore the zoom to 100%, press CTRL+0.