The second thing is the home page. After adding pictures and a banner, I scrolled and scrolled on my phone without reaching the end. So I cut the cards down: tighter on a phone, two columns on a PC. In the mockup, the PC length dropped from 2,850px to 1,770px, and the phone length from 2,580px to 2,390px.
In the freed space I put a small moving picture. It moves beside the first line of the home page and at the top of the About page, and the same picture is used for the card that appears when you share the site on KakaoTalk. There is no video or sound, and devices set to reduce motion get a still picture.