1920x1080 Pokemon GO Team mystic Google Chrome theme
You can always cancel your purchase if you do not like the theme.
If your the background image is too zoomed in you will want to make sure you have 1920x1080 screen resolution by going to your display settings through the control panel. (Control Panel\Appearance and Personalization\Display\Screen Resolution) For Windows 10.
If you have the right resolution then you may want to try clicking the three horizontal bars at the top right of Google Chrome, clicking settings, then advanced settings, then web content, click large for your font and then go back to your new tab page and hold down command or ctrl and scroll to zoom in and out to your liking.