Slideshow issue in my website

Hi,

I have installed wordpress on one of my subdomain and have activated theme “Magazino”.

I am unable to know what is the size of the image that I need to use as featured image to align it properly in my website (news.yourgoal.in)

I have tried number of sizes even smaller ones but the images gets expanded in the slide show and doesn’t look good.

Please help me with this,

Thanks in advance for your kind help

Regards,
Yourgoal