Are you referring to the FRONT Page 2 and Front Page 10 widgets on the homepage?
If so, you can take a look at the Guru Setup Guide here – https://appfinite.com/theme-setup/guru-theme-setup/ which can be accessed from the Tutorials Link in the Menu at the top of the site. Once there you’ll see the code used for the Front Page 2 widget area which looks like this – https://appfinite.com/theme-setup/guru-theme-setup/#fp2
The Images I have are set at around 600px width 400px height and they scale down to fit the users browser since they are being used with the one-third
class. The One-Third Class means you can have 3 Divs in a row that will automatically fit inside the container or widget that you’re using. The images will adjust based on the size of the browser that is viewing your site.
The image sizes that I used for the Front Page 10 widget are 170 X 170. In this widget I’m using the one-fourth
class as you can see here – https://appfinite.com/theme-setup/guru-theme-setup/#fp10
Let me know if that helps.