*{
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
.slider{
  height: 500px;
  position: relative;
}
.slider img{
  object-fit: cover;
  height:500px;
  width: 100%;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  transition: opacity .5s;
}
.slider img.active{
  opacity: 1;
}
.suivant, .precedent{
  color: #fff;
  font-size: 2rem;
  position:absolute;
  top:50%;
  transform:translateY(-50%);
}
.suivant{
  right: 1rem;
}
.precedent{
  left: 1rem;
}