body {
    overflow: hidden;
}

.arrows {
    position: absolute;
    z-index: 100;
}

/* flèche gauche */
.arrows .circles:nth-child(odd) {
    position: relative;
    top: 50vh;
    left: 1vw;
}

.arrows .circles:nth-child(odd) div {
    position: relative;
    right: 3px;
}

/* Flèche droite */
.arrows .circles:nth-child(even) {
    position: relative;
    top: 45vh;
    left: 96vw;
}

.arrows .circles:nth-child(even) div {
    position: relative;
    left: 3px;
}


/* cercles */
.circles {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: black;

    display: flex;
    justify-content: center;
    align-items: center;
}

.arrow-right {
    width: 0;
    height: 0;
    
    border-top: 16px solid transparent;
    border-bottom: 16px solid transparent;
    
    border-left: 20px solid white;
}

.arrow-left {
    width: 0;
    height: 0;
    
    border-top: 16px solid transparent;
    border-bottom: 16px solid transparent;
    
    border-right: 20px solid white;
}