何度も調べているのでメモ
IE、Edge
https://developer.mozilla.org/en-US/docs/Archive/Web/CSS/-ms-overflow-style
.container { overflow: scroll; -ms-overflow-style: none; }
Chrome、Safari
https://developer.mozilla.org/en-US/docs/Web/CSS/::-webkit-scrollbar
.container::-webkit-scrollbar { display:none; }
Firefox
https://developer.mozilla.org/en-US/docs/Web/CSS/scrollbar-width
.container { scrollbar-width: none; }