.centrer-verticalement{display:flex;flex-direction:column;justify-content:center;display:-webkit-box;display:-webkit-flex;display:-moz-box;display:-ms-flexbox;-webkit-box-orient:vertical;-webkit-box-direction:normal;-webkit-flex-direction:column;-moz-box-orient:vertical;-moz-box-direction:normal;-ms-flex-direction:column;-webkit-box-pack:center;-webkit-justify-content:center;-moz-box-pack:center;-ms-flex-pack:center}#1_slide{position:absolute;top:15vh;z-index:2;width:1660px;height:900px;animation-name:animation-slide-devant;animation-duration:100s;animation-iteration-count:infinite;-moz-animation-name:animation-slide-devant;-o-animation-name:animation-slide-devant;-webkit-animation-name:animation-nuages-devant;-moz-animation-duration:100s;-o-animation-duration:100s;-webkit-animation-duration:100s;-moz-animation-iteration-count:infinite;-o-animation-iteration-count:infinite;-webkit-animation-iteration-count:infinite}@keyframes animation-slide-devant{0%{bottom:-2000px}100%{top:2000px}}@-moz-keyframes animation--slide-devant{0%{bottom:-2000px}100%{top:2000px}}@-o-keyframes animation--slide-devant{0%{bottom:-2000px}100%{top:2000px}}@-webkit-keyframes animation--slide-devant{0%{bottom:-2000px}100%{top:2000px}}