Material Theme banners and category thunbnails specifications
Homepage banners template
Your homepage banners can be designed using the PSD template found in your material theme photoshop files that you received with your theme.
Homepage categories thumbnail dimensions
Demo categories thumbnails are also included in your material theme image files. You may use those as a guide on how large your thumbnail images should be. Our demo thumbnails for category images are 320x320px. Make sure that you set your category thumbnails height and width are set to these dimensions in your settings page. Your thumbnails size settings are found in Settings / Thumbnails. The two corresponding size fields are illustrated below.