/* era: .slide:nth-child(4) { background: url("assets/img/slide/ex.webp") ... } */
#slide4{
  position: relative;
  width: 100%;
  min-height: 100vh;            /* o height:100vh; */
  background: url("../../img/slide/ex.webp") center / cover no-repeat;
  overflow: hidden;
}