.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;
}