预设尺寸
FB Page Cover:1640x664
FB Shared Image:1200x630
FB Event Image:1920x1080
FB Group Header:1640x856
Instagram:1080x1080
Insta Story:1080x1920
YouTube Thumbnail:1280x720
YouTube Profile:800x800
YouTube Cover:2560x1440
A4:2480x3508
小红书竖版:900x1200
小红书横版:1200x900
iPhone 6 7 8:750x1334
iPhone X:1125x2436
iPhone 12:1170x2532
Kindle:1200x860
