.ISISlider{
    height: 400px;
    width: 600px;
    position: relative;
}
.ISISlider img{
    object-fit: cover;
    height: 100%;
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0;
    transition: opacity 1s;
}
.ISISlider img.Actif{
    opacity: 1;
}

.ISISlider .Precedant, .ISISlider .Suivant{
    color: #fff;
    font-size: 2rem;
    position: absolute;
    top: 50%;
    cursor: pointer;
    transform: translateY(-50%);
}
.ISISlider .Precedant{
    left: 5px;
}
.ISISlider .Suivant{
    right: 5px;
}