slider{ display:flex; flex: none; align-items: stretch; overflow: hidden; }
slider a{ text-decoration: none; display:flex; flex: none; align-items: center; justify-content: center; color: var(--main-color); z-index: 10; width: 5%; }
slider a.prevbt{  margin-right: -5%; }
slider a.nextbt{  margin-left: -5%; }
slider a span{ display: inline-flex; flex: none; align-items: center; justify-content: center; width: 2em; aspect-ratio: 1/1; background-color: var(--zone-back); border-radius: 100%; }
slider slidein{ display:flex; flex: none; align-items: stretch; width: 100%; z-index: 1; }
slider slidect{ display:flex; flex: none; align-items: stretch; }
slider slide{ display:inline-flex; flex: none; }