All modern browsers support scaling of screen resolution to allow users to enlarge the content of the webpage being viewed to be zoomed up and down to suit their needs.
Windows
Zoom in
To zoom into the webpage making all the content larger hold Ctrl (Control key) and press the (plus) + key.
Zoom out
To zoom out of the webpage making all the content smaller hold Ctrl (Control key) and press the (minus) - key.
Reset scale
To return the page to it′s standard magnification hold Ctrl (Control key) and press the (zero) 0 key.
Apple Mac
The same proceedures are used on Apple Macs but Ctrl is replaced by the Command key.