.conteneur{
  width: 1440px;
  height: 640px;
  border: 0px #aaa solid; 
  text-align: center;

}
h2 {
    text-align: center;
}

div, span {
  border: solid 0px black;
}

img {
  width: 1440px;
}

#text-align {
    text-align: center;
 }

#margin-auto {
  width: 1440px;
  display: block;
  margin-left: auto;
  margin-right: auto;
}

#display-flex-h {
  display: flex;
  justify-content: center;
}

#img-flex-h {
  width: 1440px;
}

#display-flex-v {
  display: flex;
  align-items: center;
  height: 800px;
}

#img-flex-v {
  width: 1440px;
}

#position-transform {
  position: relative;
  height: 800px;
}

#img-absolute {
  width: 1440px;
  position: absolute;
  top: 50%;
  transform: translate(0%, -50%);
}

#position-transform-bis {
  width: 100%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

#img-absolute-bis {
  width: 100%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}