* {box-sizing: border-box}

/* Container needed to position the overlay. Adjust the width as needed */
.overlaycontainer {
  position: relative;
  /*width: 50%;*/
  width: 100%;
  /*max-width: 300px;*/

}

/* Make the image to responsive */
.overlayimage {
  display: block;
  width: 100%;
  height: auto;
}

/* The overlay effect - lays on top of the container and over the image */
.overlay {
  position: absolute; 
  bottom: 0; 
  background: rgb(0, 0, 0);
  background: rgba(0, 0, 0, 0.8); /* Black see-through */
  color: #f1f1f1; 
  width: 100%;
  transition: .5s ease;
  opacity:0;
  color: white;
  font-size: 20px;
  padding: 20px;
  text-align: center;
}

/* When you mouse over the container, fade in the overlay title */
.overlaycontainer:hover .overlay {
  opacity: 1;
}