Question about resizing index thumbnails on Blogger Mobile Template


Hello! I’m Ayaka. I have been customising my culinary blog ( ), but am not quite satisfied with those low-quality and small sized mobile index thumbnails on my home page of my blog. I would very like to know whether I can change the size and the quality of the index thumbnails on blogger mobile custom template - possibly I want to enlarge them to the full width of the device, then I guess they would not be called thumbnails anymore?? Anyhow, I would be very glad if anyone could help me resize them while bringing back the quality of the original picture. Thank you!