.diapo{
    position: relative;
    overflow: hidden;
}

#nav-droite, #nav-gauche{
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: white;
    font-size: 3em;
}

#nav-droite{
    right: 20px;
}
#nav-gauche{
    left: 20px;
}

.elements{
    display: flex;
    transition: 1s linear;
}

.element{
    flex: 1 0 100%;
    position: relative;
}

.element > img{
    width: 100%;
}

.caption{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    background-color: rgba(255,255,255,0.4);
    padding: 30px;
}

.las{
	-moz-osx-font-smoothing:grayscale;
	-webkit-font-smoothing:antialiased;
	display:inline-block;
	font-style:normal;
	font-variant:normal;
	text-rendering:auto;
	line-height:1;
}