Desktop1280x800px | 1440x900px | 2560x1600px | 1680x1050px
Smartphone 750x1334px (iPhone 6/6S/7/8, etc.) without calendar | 1242x2208px (iPhone 6 Plus/6S Plus/7 Plus/8 Plus, etc.) | 640x1136px (iPhone 5/5C/5S/SE, iPod Touch 5g, etc.) | 1125x2436px (iPhone X) | iPads