:= 16:9
16:9
common ratios
sizes at 16:9
320px wide320 × 180
480px wide480 × 270
640px wide640 × 360
720px wide720 × 405
1080px wide1080 × 608
1280px wide1280 × 720
1440px wide1440 × 810
1920px wide1920 × 1080
2560px wide2560 × 1440
3840px wide3840 × 2160