.image-container {
  position: relative;
  width: 75%;
  margin: 0 auto;
  overflow: visible;
}

#background_home {
  width: 100%;
  height: auto;
  display: block;
  opacity: 0.5; /* modifie cette valeur selon la transparence souhaitée */
}

#overlay_image {
  position: absolute;
  bottom: -100px;             
  left: 50%;
  transform: translateX(-50%);
  width: 25%;          
  height: auto;
}