Has anyone come up with best settings/tools for creating C4E banner images to avoid blurryness? I've created a banner in Canva with the recommended 5:1 ratio. Everything looks nice and crisp in Canva and in the thumbnail on the course settings screen, but after saving and reloading my homepage everything is blurry. I've tried ratios from 1000:200 to 4000:800 and different Canva fonts and stickers, but nothing I've tried results in a crisp resolution in Canvas. A vector graphic would be ideal, but Canvas doesn't accept .svg files for the banner so I'm using a .png. Are people creating crisp, clear banners for C4E? What are you using?